Raska, 19, was also a member of Team Czech Republic at the 2021 World Junior Championships, where he tallied one assist and six penalty minutes in four games.
Over his two-year career in Rimouski, the hard-nosed forward has skated in 57 games, collecting 46 points (25 goals, 21 assists), 67 penalty minutes and a plus-14 rating.
Internationally, Raska has represented the Czech Republic on multiple occasions, including in the 2020 and 2021 World Junior Championships and 2019 U-18 World Junior Championships.
The five-foot-eleven, 175-pound native of Frydek-Mistek, Czech Republic was originally selected by San Jose in the seventh round (201st overall) of the 2020 NHL Draft.