Blais was assigned to AHL San Antonio on Sunday.
Blais (upper body) was demoted to the minors Saturday, Tom Timmermann of the St. Louis Post-Dispatch reports.
Blais (upper body) will not play in Friday night's home game against the Jets, Lou Korac of NHL.com reports.
Blais (undisclosed) left Tuesday's game against the Sharks, Jeremy Rutherford of The Athletic St. Louis reports.
Blais was called up from AHL San Antonio on Monday.
Blais (lower body) was activated from injured reserve Friday and subsequently sent to AHL San Antonio.
Blais (lower body) skated on his own Thursday morning, the St. Louis Post-Dispatch reports.
Blais was placed on injured reserve Monday.
Blais (lower body) won't play in Sunday's game against Winnipeg, Jim Thomas of the St. Louis Post-Dispatch reports.
Blais suffered a lower-body injury that will keep him out of the rest of Saturday's clash with the Jets.