The forward, who has eight points (five goals, three assists) in 20 games this season, was injured in a 3-1 win against the Tampa Bay Lightning on Tuesday.
Selected by St. Louis in the sixth round (No. 176) of the 2014 NHL Draft, Blais has 15 points (eight goals, seven assists) in 63 regular-season games and three points (one goal, two assists) in 15 Stanley Cup Playoff games. He helped the Blues win the Stanley Cup for the first time in their 51-season history last season.
Also Wednesday, the Blues signed forward
Troy Brouwer
to a one-year, two-way contract worth $750,000.
The 34-year-old, who had 21 points (12 goals, nine assists) in 75 games with the Florida Panthers last season, played with the Blues in 2015-16, finishing with 39 points (18 goals, 21 assists) in 82 games.
Selected by the Chicago Blackhawks in the seventh round (No. 214) of the 2004 NHL Draft, Brouwer has 362 points (181 goals, 181 assists) in 838 games with the Blackhawks, Washington Capitals, Calgary Flames, Blues and Panthers.
