However, according to the Providence Journal, Rask told Czech media following the game that this injury is not serious.
"I slightly pulled my groin, it is not serious. I had groin problems last year so I took a little rest just for precaution," Rask said.
The young netminder suffered a similar injury back in March in a game against the New York Islanders. He missed the final 19 games of the season due to the lower-body injury.
In 23 games with the Bruins last season, Rask registered a .929 save percentage and 2.05 goals-against average.