Berube surprised reporters Saturday by suggesting that Scott Perunovich might be available if needed for Game 4.
The rookie defenseman has been out of the lineup since Jan. 15 and underwent surgery on his wrist in March.
"He's a possibility," Berube said of Perunovich. "He hasn't played games in a long time, and it was good he could run that power play with Krug out right now, so we'll see how that goes. He needed some reps. It was one of the reasons we wanted to (practice) today, too. It's good to see him, he's back, he's ready to go if we need him, so we'll see."
The team also has Steven Santini available. Santini was recalled under emergency conditions Thursday and was ready to play, but Marco Scandella's return from a lower-body injury in Game 3 kept him out of the lineup.
Santini has 119 games of NHL experience with the Blues, Nashville Predators and New Jersey Devils.