Blais, 21, has dressed in nine games for the Blues this season, posting one goal and two assists.
The 6-foot-2, 205-pound forward has also appeared in 11 games for the Rampage, recording 13 points (five goals, eight assists). The Montmagny, Quebec native was originally drafted by the Blues in the sixth round, No. 176 overall, of the 2014 NHL Draft.