The 6'3", 198-pound forward split this season with MHK Dynamo Moscow of the Russia Junior Hockey League and Dynamo Moscow of the KHL. Trineyev, 20, recorded 18 points (3g, 15a) in 21 games with MHK Dynamo Moscow and played in 11 games with Dynamo Moscow (KHL). In the 2020-21 season, Trineyev recorded 30 points (15g, 15a) in 33 games and nine points (3g, 4a) in 14 playoff games with MHK Dynamo Moscow, winning the MHL Championship.
Internationally, Trineyev won a gold medal with Team Russia at the 2019 Hlinka Gretzky Cup, recording four points (2g, 2a) in four games.
The Capitals selected Trineyev in the fourth round with the 117th overall pick in the 2020 NHL Draft. The Voronezh, Russia, native was ranked seventh among European right wings and 19th overall among all forwards by NHL Central Scouting prior to the 2020 NHL Draft.
