Fowler logged an assist in Thursday's 3-1 loss to the Lightning.
Fowler made his Blues debut Saturday in a 2-1 overtime loss, failing to record a point but producing one shot on net, one blocked shot and one hit in 17:35 of ice time.
Fowler was traded to St. Louis for a fourth-round pick and prospect Jeremie Biakabutuka, Elliotte Friedman of Sportsnet reports.
Fowler (upper body) will be activated off injured reserve and draw into the lineup Wednesday versus Vegas, per Derek Lee of The Hockey News.
Fowler (upper body) is expected to be out for 2-4 weeks.
Fowler (upper body) was placed on injured reserve Tuesday, per the NHL media site.
Fowler will be a game-time decision ahead of Friday's matchup with Minnesota, Derek Lee of The Hockey News reports.
Fowler provided an assist and blocked two shots in Friday's 6-3 loss to the Flames.
Fowler recorded a power-play assist and went minus-2 in Saturday's 6-1 loss to the Oilers.
Fowler provided a power-play assist and fired four shots on goal in Thursday's 4-0 win over the Blackhawks.