Semyonov, 26, skated in 60 games for Avangard Omsk (KHL) in 2020-21, registering 26 points (10 goals, 16 assists) while adding nine points (four goals, five assists) in 23 playoff games, capturing the Gagarin Cup. In 377 regular season KHL games, the Omsk, Russia native has recorded 169 points (70 goals, 99 assists) and 29 points (15 goals, 14 assists) in 65 playoff games. Semyonov was selected to represent Omsk in the 2019 All-Star Game.