Walman (upper body) will miss out against the Red Wings on Thursday, Jeremy Rutherford of The Athletic reports.
It's just the latest blow for the Blues, who are already without a full complement of forwards, which is why Walman was playing in the first place. Without the 25-year-old defenseman, St. Louis will once again be forced to play with just 17 skaters in Thursday's matchup before the team will be able to call up a player from AHL Springfield.