The NHL season is more than a month old, and there have been four trades plus extensions signed by Jake Oettinger, Alexis Lafreniere, Linus Ullmark and others.

Other top players also remain eligible for extensions, including Igor Shesterkin, Mikko Rantanen, Mitch Marner, John Tavares, Brock Boeser.

There will be more trades as teams build toward a Stanley Cup run or make moves for their long-term future. Here are key dates to watch: the holiday roster freeze in December, the league’s break for the 4 Nations Face-Off in February and the trade deadline in early March.

Follow along here this season for signings, trades, transactions and other news from the NHL:

Nov. 18: Islanders’ Mike Reilly to have procedure on heart

General manager Lou Lamoriello told reporters that the pre-existing heart condition was discovered during routine testing for a concussion that had sidelined the defenseman since Nov. 1.

‘It’s probably a blessing in disguise of what transpired,’ Lamoriello said. ‘They detected this, something that you’re sometimes born with, but never knew.’

He said Reilly has been cleared from the concussion.

Nov. 18: Sabres send down goalie; Sharks call one up

The Buffalo Sabres sent 22-year-old goalie Devon Levi to the American Hockey League to get him some playing time amid his recent struggles. The team will use Ukko-Pekka Luukkonen and recently reacquired James Reimer as their tandem. Levi has given up 17 goals in his last four starts.

Meanwhile, the San Jose Sharks called up highly touted goalie prospect Yaroslav Askarov, 22, after he went 6-3 with a 1.92 goals-against average in the AHL. He was acquired from the Nashville Predators in an offseason trade. Sharks goalie Vitek Vanecek had left Saturday’s game with an injury.

Also: The NHL announced that last month’s Carolina Hurricanes-Tampa Bay Lightning game, whichas was postponed by Hurricane Milton, has been rescheduled for Jan. 7 at 7 p.m. ET. … Philadelphia Flyers goalie Samuel Ersson (lower body) was placed on injured reserve.

Nov. 15: Avalanche’s Valeri Nichushkin returns from suspension

Colorado Avalanche forward Valeri Nichushkin returned Friday night from his six-month suspension. He was suspended during the playoffs last May under Stage 3 of the NHL/NHLPA Player Assistance Program. He also was in the program for about two months earlier in the 2023-24 season and missed part of the 2023 playoffs for personal reasons. Nichushkin is a key offensive contributor with 28 goals in 54 games last season. Injured forwards Jonathan Drouin and Miles Wood also returned Friday.

Also: The Vegas Golden Knights signed defenseman Brayden McNabb, the franchise leader in games played, to a three-year contract extension that averages $3.65 million a year.

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Nov. 13: Sabres claim goalie James Reimer off waivers

The Buffalo Sabres claimed goaltender James Reimer off waivers, bringing him back to where he signed a free agent contract in the summer. Reimer was claimed by the Anaheim Ducks off waivers earlier this season when the Sabres tried to send him to the American Hockey League. The Ducks put him on waivers after the return of injured goalie John Gibson. Reimer, on a one-year, $1 million contract, played two games in Anaheim with a 4.50 goals-against average. No. 1 Sabres goalie Ukko-Pekka Luukkonen was hurt in Monday’s loss but hasn’t been ruled out for Thursday’s game.

Also: Boston Bruins defenseman Hampus Lindholm will be out ‘weeks’ with a lower-body injury after blocking a shot, coach Jim Montgomery said.

Nov. 12: Capitals reacquire Lars Eller in trade with Penguins

Center Lars Eller, 35, is a familiar face for the Washington Capitals after playing in Washington from 2016-23 and winning a Stanley Cup there in 2018. He kills penalties and is strong in the faceoff circle. The Pittsburgh Penguins’ side of the trade might be more interesting. They get a 2027 third-round pick and a 2025 fifth-rounder, and this also could be an indication that the Penguins are shaking up the roster after a disappointing start. Eller’s trade will allow the team to give more ice time to younger players. He’s a pending unrestricted free agent.

Also: The Winnipeg Jets claimed goalie Kaapo Kahkonen off waivers from the Colorado Avalanche and loaned him to their American Hockey League affiliate. They had lost him on waivers to the Avalanche last month.

Nov. 11: Flames’ Anthony Mantha to have season-ending surgery

Also: The Colorado Avalanche placed goalie Kaapo Kahkonen on waivers. They had claimed him off waivers from the Winnipeg Jets last month.

Nov. 9: Penguins recall veteran goalie Tristan Jarry from minors

The Pittsburgh Penguins recalled two-time All-Star goalie Tristan Jarry from his conditioning stint in the American Hockey League. Jarry was loaned to Wilkes-Barre/Scranton on Oct. 26 after recording a 5.37 goals-against average and .836 save percentage. His AHL numbers were 2.16, .926.

Also: The Philadelphia Flyers made rookie Matvei Michkov a healthy scratch for a second consecutive game.

Nov. 8: Kraken acquire Daniel Sprong from Canucks

The Seattle Kraken landed Daniel Sprong, one of their former players, in exchange for future considerations. The Kraken have struggled to score this season and Sprong had 21 goals for them two seasons ago. The forward has scored double-digit goals five times. He had one goal with Vancouver this season.

Nov. 7: Flyers rookie Matvei Michkov to be healthy scratch

Coach John Tortorella called the move ‘part of the process.’

‘With young guys, they can watch games, too, as far as development,’ he told reporters. ‘It’s trying to help them.’

Michkov, 19, has 10 points in 13 games and a minus-8 rating and was NHL rookie of the month in October. He had just one point in his last five games and his ice time dropped in the last four.

Nov. 4: Sharks’ Macklin Celebrini ready to return from injury

San Jose Sharks center Macklin Celebrini, the No. 1 overall pick in the 2024 draft, is ready to return to action after aggravating an injury in the season opener, according to NHL.com.

He took part in practice Monday on the top line with Tyler Toffoli and Mikael Granlund and is looking to play his second game season Tuesday night against the Columbus Blue Jackets.

Celebrini said he reinjured his hip on his first shift of the opener but played the full game and had a goal and assist. He has missed 12 games. The Sharks opened the season 0-7-2 but are 3-1 in their last four games.

Also: St. Louis Blues defenseman Philip Broberg will be out four to six weeks with a lower-body injury. He needed help getting off the ice Saturday after he was checked by the Toronto Maple Leafs’ Mitch Marner. … The Boston Bruins signed forward Tyler Johnson to a one-year, $775,000 contract. He won two Stanley Cups with the Tampa Bay Lightning and spent the last three seasons with the Chicago Blackhawks.

Nov. 2: Islanders’ Mathew Barzal, Adam Pelech go on injured list

New York Islanders No. 1 center Mathew Barzal was placed on long-term injured reserve with an unspecified upper-body injury. He’ll be out four to six weeks. He had 80 points in 80 games last season but had been limited to five points in 10 games this season as the Islanders have struggled to score.

Islanders defenseman Adam Pelech also will be out four to six weeks after being hit in the face by a puck. He went on the injured list.

Oct. 30: Sharks acquire Timothy Liljegren from Maple Leafs

The Toronto Maple Leafs get defenseman Matt Benning, a 2025 third-round pick and a 2026 sixth-rounder. Liljegren, 25, had been limited to one game in Toronto this season, and the Maple Leafs recently committed to blue-liner Jake McCabe with a five-year extension. But Liljegren should fit in well in San Jose, which is building around younger players. Benning, 30, and Liljegren are signed through 2025-26.

This is the second day with an NHL trade after none previously since the season opened in North America.

Oct. 29: Utah acquires defenseman Olli Maatta from Red Wings

The Utah Hockey Club gives up a third-round pick as it addresses a desperate need for a veteran defenseman. Sean Durzi and John Marino are out long-term after surgery. Utah has been leaking goals during a four-game losing streak, including blowing a 4-1 lead late in the third period against the previously winless San Jose Sharks. Maatta is solid defensively and has nearly 700 games of NHL experience.

Oct. 28: Maple Leafs sign Jake McCabe to five-year extension

The Toronto Maple Leafs signed defenseman Jake McCabe to a five-year extension with an annual average value of $4.51 million. Sportsnet’s Elliotte Friedman reports there is some deferred money in the deal. McCabe, 31, had been acquired from the Chicago Blackhawks in a February 2023 trade and ranks fourth on the team in average ice time this season. He has three assists in nine games and a team-best plus-6 rating.

Also: The New York Rangers recalled rugged forward Matt Rempe from the American Hockey League after he played two games there. The Rangers play the Washington Capitals on Tuesday in what has become a feisty rivalry.

Oct. 26: Penguins send goalie Tristan Jarry to minors

The Pittsburgh Penguins sent two-time All-Star goaltender Tristan Jarry to their American Hockey League affiliate on a conditioning loan after his early season struggles. He had been sent home from the Penguins’ road trip to work on his game after recording a 5.47 goals-against average and .836 save percentage in three games. He was pulled from his last start on Oct. 16 and gave up six goals in the opener.

Jarry is in the second season of a five-year contract that carries a $5.375 million cap hit. Rookie Joel Blomqvist has had the most starts in the Penguins net this season and Alex Nedeljkovic recently returned from an injury.

Also: The New York Islanders signed rugged forward Matt Martin for the rest of the season. He had been to camp on a tryout agreement after spending 13 of his 15 seasons with the Islanders.

Oct. 25: Rangers’ Alexis Lafreniere gets seven-year extension

The New York Rangers and Alexis Lafreniere have agreed to a seven-year extension as he builds on last season’s breakthrough. The 2020 No. 1 overall pick will average $7.45 million in the deal, according to lohud.com, part of the USA TODAY Network. That’s up from this year’s $2.325 million cap hit. Lafreniere, 23, broke through with 28 goals and 57 points last season and added eight goals and 14 points in the playoffs. He is averaging a point a game this season through seven games and scored his fourth goal of the season on Thursday. He is signed through 2031-32.

Oct. 24: Golden Knights’ Shea Theodore signs for seven years

Vegas Golden Knights defenseman Shea Theodore will average $7.425 million in the extension, which kicks in next season and runs through 2031-32. Getting him signed now is important after the Golden Knights lost Jonathan Marchessault, Chandler Stephenson and others from their 2023 Stanley Cup team to free agency during the summer.

Theodore, 29, is the franchise’s top-scoring defenseman with 296 points and has opened this season with seven points in six games. Vegas’ top three defensemen (also Alex Pietrangelo and Noah Hanifin) are signed through at least 2026-27.

Oct. 23: Utah’s Sean Durzi, John Marino out long-term after surgery

The Utah Hockey Club, who beefed up their defense in the offseason, will be without two key blueliners long-term after they had surgery.

Sean Durzi, who was injured in an Oct. 15 game, will miss four to six months after shoulder surgery. John Marino, who has yet to play this season, is out three to four months after back surgery.

Utah added defensemen Mikhail Sergachev, Marino and Ian Cole in the offseason. Durzi, acquired last season when the team was in Arizona, signed a four-year, $24 million contract during the summer.

In other injury news, St. Louis Blues forward Robert Thomas has a fractured ankle and will be evaluated in six weeks.

Oct. 22: Panthers give coach Paul Maurice contract extension

Maurice, who joined the Panthers in 2022-23, went to the Stanley Cup Final in his first season and won it last year. His 29 playoff wins are a franchise record.

He has 98 regular-season wins with Florida and his 873 career wins rank fourth all time in NHL history.

Also: The Blues signed forward Jake Neighbours to a two-year, $7.5 million contract extension.

Oct. 17: Stars’ Jake Oettinger signs eight-year contract extension

The Dallas Stars signed goalie Jake Oettinger to an eight-year, $66 million contract extension that kicks in next season. The $8.25 million cap hit matches the deals recently signed by the Bruins’ Jeremy Swayman and Senators’ Linus Ullmark.

Oettinger has led the Stars to the Western Conference final the past two seasons.

Oct. 12: Aleksander Barkov, Macklin Celebrini are injured

The NHL season is young, but two prominent players are already out with injuries.

Florida Panthers captain Aleksander Barkov will miss two to three weeks after crashing leg first into the boards while trying to prevent an empty net goal on Thursday. His stick had broken but he couldn’t stop Ottawa’s Tim Stutzle from scoring. The time frame should allow Barkov to participate in the two Global Series games against the Dallas Stars in Tampere, Finland, on Nov. 1-2. Barkov is the first Finnish NHL captain to win the Stanley Cup. He won the Selke Trophy last season for the second time as top defensive forward.

Meanwhile, the San Jose Sharks placed No. 1 overall pick Macklin Celebrini on injured reserve with a lower-body injury. Coach Ryan Warsofsky said Celebrini is week-to-week. He had been dealing with an injury in training camp but played in this week’s season opener, scoring a goal and an assist.

Oct. 11: Avalanche claim goalie Kaapo Kahkonen off waivers

In a busy day for goalie transactions, the Colorado Avalanche claimed Kaapo Kahkonen off waivers from the Winnipeg Jets. Colorado lost 8-4 in the opener, with Alexandar Georgiev giving up five goals and backup Justus Annunen giving up two goals on four shots. The Avalanche are Kahkonen’s fourth team in a year. He split time last season between the San Jose Sharks and New Jersey Devils.

In other moves, the Minnesota Wild called up Jesper Wallstedt, their goalie of future, who will join Game 1 winner Filip Gustavsson and Marc-Andre Fleury. The Nashville Predators sent down Matt Murray, who backed up Scott Wedgewood on Thursday with injured No. 1 goalie Juuse Saros unable to play.

Oct. 10: Hurricanes-Lightning game postponed because of Milton

Saturday’s game between the Carolina Hurricanes and Tampa Bay Lightning has been postponed as the Tampa Bay area recovers from Hurricane Milton. The league said a makeup date would be announced as soon as it can be confirmed.

The Lightning are playing their season opener in Carolina on Friday. Saturday’s game was to be the start of a three-game homestand (also Tuesday and Thursday).

Amalie Arena got through the storm fine, though Tropicana Field, home of MLB’s Tampa Bay Rays in St. Petersburg, Florida, suffered major damage to its roof.

Oct. 10: Blue Jackets captain Boone Jenner has surgery

Jenner had shoulder surgery to repair an injury he suffered during training camp and could miss up to six months.

‘Our hope is he can return before the end of the season,’ said Columbus Blue Jackets general manager Waddell. ‘His loss will be felt by our club, but we have a strong leadership group in place and players will be given an opportunity to take on greater roles on and off the ice.’

Boone, who finished second on the Blue Jackets last season with 22 goals and is the franchise leader in games played, has been the team’s captain since 2021-22.

Oct. 9: Linus Ullmark, Joey Daccord get contract extensions

Ullmark, who won the Vezina Trophy with the Bruins in 2022-03, was traded to the Ottawa Senators this offseason so Boston had the room to re-sign Swayman. Ullmark will get four years, $33 million from the Senators and have the same $8.25 million cap as Swayman.

Meanwhile, Seattle Kraken goaltender Joey Daccord received a five-year, $25 million extension. He filled in for Philipp Grubauer after that goalie’s injury last season and got the NHL’s first shutout in the Winter Classic. Both contracts will take effect next season.