Already up 2-0 in their first-round series, the Winnipeg Jets could look even stronger for Game 3.
Ehlers, 29, was ruled out on a week-to-week basis earlier in April after aggravating a right foot injury when he collided with an official in a game against the Chicago Blackhawks.
The Denmark native recorded 24 goals and 39 assists in 69 games this season.
The Presidents’ Trophy-winning Jets won Game 2 by a 2-1 score on Monday to increase their series advantage against the Blues.
Winnipeg and St. Louis meet for Game 3 on Thursday, with live coverage on Sportsnet and Sportsnet+ beginning at 9:30 p.m. ET / 8:30 p.m. CT.