September The Lightning's off-season began after the team captured its second
Stanley Cup in franchise history in a 4–2 series win over the
Dallas Stars.
October On October 7, 2020, the Lightning re-signed forwards
Mitchell Stephens and
Gemel Smith to contract extensions. Stepehens was signed to a two-year extension after being part of the 2020 Stanley Cup championship roster. Smith signed a one-year deal after appearing in three regular season games for the Lightning and spending the majority of the season with the Lightning's
American Hockey League (AHL) affiliate, the
Syracuse Crunch. At the
2020 NHL entry draft, the Lightning selected Jack Finley,
Gage Goncalves, Maxim Groshev,
Jack Thompson, Eamon Powell, Jaydon Dureau, Nick Capone,
Amir Miftakhov and Declan McDonnell. Later in the evening, the Lightning announced that it had issued qualifying offers to
Anthony Cirelli,
Erik Cernak,
Ross Colton,
Mathieu Joseph,
Dominik Masin,
Mikhail Sergachev,
Ben Thomas and
Alex Volkov. The team did not issue qualifying offers to Devante Stephens,
Carter Verhaeghe and Dennis Yan. On October 9, 2020, the Lightning placed
Tyler Johnson on waivers after being unable to trade him prior to free agency. Johnson has a $5 million cap hit with four years remaining on his current contract with the Lightning. Johnson cleared waivers the following day after going unclaimed by another team. That same day, the Lightning announced that it had signed forward
Patrick Maroon to a two-year contract extension. Maroon skated in all of the Lightning's playoff games on their way to winning their second Stanley Cup in franchise history. Around the same time, the Lightning re-signed defenseman
Luke Schenn to a one-year contract extension. Scheen appeared in 25 regular season games and 11 playoff games during the Lightning's championship run the prior season. Schenn's contract counted for $800,000 against the salary cap. The Lightning also made a series of depth signings that day. The Lightning signed defenseman
Andreas Borgman and goaltender and
Christopher Gibson. Martin had spent the previous season with the Syracuse Crunch in the AHL. Borgman played in 53 games this past season for the AHL's
San Antonio Rampage. Gibson appeared in net in 25 games for the AHL's
Bridgeport Sound Tigers during the prior season. On October 12, 2020, the Lightning announced the re-signing of defensemen prospect Ben Thomas. Thomas had been playing for the Syracuse Crunch for the past four seasons, during which time he appeared in over 200 career games. Thomas was originally drafted by Lightning in the fourth round of the
2014 NHL entry draft. On October 14, 2020, the Lightning announced that it had re-signed forward prospect Ross Colton. Colton had spent the last two years playing for the AHL's Syracuse Crunch. Colton was drafted by the Lightning in the fourth round of the
2016 NHL entry draft. On October 23, 2020, it was announced that assistant coach
Todd Richards was leaving the Lightning to take an assistant coaching job with the
Nashville Predators. Richards spent the past four seasons with the Lightning and helped the team capture its second Stanley Cup.
November On November 25, 2020, the Lightning announced the re-signing of defenseman
Mikhail Sergachev to a three-year contract extension. The contract carried a $4.8 million cap hit. Since coming over to the Lightning via trade, Sergachev produced three straight seasons of more than 30 points and helped the franchise to its second Stanley Cup.
December On December 7, 2020, the Lightning announced the hiring of assistant coach
Rob Zettler. Zettler was previously an assistant of Lightning head coach
Jon Cooper when he was the head coach of the AHL's Syracuse Crunch. Zettler took over as head coach of the Crunch after Cooper was promoted to be the Lightning's head coach. Zettler was released by the team after three seasons. Zettler went on to spend two seasons as an assistant coach with the
San Jose Sharks and a season of prospect coaching for
Adam Oates and the Oates Sports Group. Zettler filled the vacancy left by the departure of Todd Richards. Richards worked with the Lightning defensemen and handled the team's penalty kill. On December 12, 2020, the Lightning announced the signing of 2020 NHL draft pick Jack Finley. Finley spent the past three seasons with the
Spokane Chiefs of the
Western Hockey League (WHL), where he has skated in 131 career WHL games and recorded 28 goals and 77 points. On December 13, 2020, the Lightning announced the signing of another 2020 NHL draft pick, center Gage Goncalves, to a three-year entry-level contract. Goncalves was previously an undrafted camp invite by the WHL's
Everett Silvertips before being drafted by the Lightning. Gonclaves appeared in 128 career WHL games, recording 34 goals, 52 assists and 86 points. On December 22, 2020, the Lightning announced the re-signing of defenseman
Erik Cernak to a three-year contract extension. Cernak played in 67 games last season and lead the team in hits with 172. In the Lightning's championship run, Cernak appeared in all 25 games, during which he averaged over 20 minutes of ice time per game, fourth-highest amongst Lightning defensemen. On December 23, 2020, the Lightning announced the re-signing of forwards Mathieu Joseph and Alexander Volkov. Joseph was signed to a two-year extension and Volkov was signed to a one-year extension. Both forwards split the season between the Lightning and the Syracuse Crunch. Joseph played in 37 regular season games with the Lightning, scoring four goals and three assists. Volkov appeared in nine regular season games, recording one assist. Volkov also drew into the Lightning's Stanley Cup-clinching game win over the Dallas Stars. The Lightning also announced the re-signing of defenseman
Jan Rutta to a two-year extension. Rutta played in 33 regular season games, recording a goal and six assists. Rutta also plated in six playoff games, recording a lone assist during the Lightning's Stanley Cup run. Rutta was originally acquired by the Lightning via trade from the
Chicago Blackhawks in 2019. On December 24, 2020, the Lightning announced the re-signing of forward Anthony Cirelli to a three-year contract extension. Cirelli had 16 goals and 28 assists over 68 games in the regular season. Cirelli also recorded six assists in the Lightning's 25 playoff games. Along with winning the Stanley Cup, Cirelli finished the past season fourth in
Frank J. Selke Trophy voting, which trophy is awarded to the NHL's best defensive forward. On December 27, 2020, the Lightning announced that it had traded
Braydon Coburn,
Cedric Paquette and their
2021 second-round draft pick to the
Ottawa Senators in exchange for
Anders Nilsson and
Marian Gaborik. Both Nilsson and Gaborik were immediately placed on long-term injured reserve for additional salary cap space to allow the Lightning to become salary cap compliant for the upcoming season. ==Training camp==