Gusev was selected by the Tampa Bay Lightning in the seventh round (No. 202) of the 2012 NHL Draft but played the following seven seasons in the Kontinental Hockey League.

The Vegas Golden Knights made arrangements to select Lightning defenseman Jason Garrison at the 2017 Expansion Draft. By doing so, they also received Gusev's NHL rights.

Gusev never played a game for the Golden Knights and was traded to the Devils on July 29, 2019. He signed a two-year, $9 million contract the same day.

Gusev scored 44 points (13 goals, 31 assists) in 66 games with New Jersey before the NHL paused the 2019-20 season on March 12 due to concerns surrounding the coronavirus.

On the international stage, Gusev represented Russia at the 2012 IIHF World Junior Championship and the 2018 PyeongChang Olympics.

NOTES & TRANSACTIONS

• Traded to Vegas by Tampa Bay with Tampa Bay's 2nd round pick (later traded to Columbus - Columbus selected Alexandre Texier) in 2017 NHL Draft and Pittsburgh's 4th round pick (prevously acquired) in 2018 NHL Draft for Expansion Draft considerations, June 21, 2017.
• Traded to New Jersey by Vegas for a 3rd-round pick in 2020 NHL Draft and 2nd-round pick in 2021 NHL Draft, July 29, 2019.
• Signed as a free agent by Florida, April 11, 2021.