Wieters played catcher for the first time on Tuesday and reported no ill effects after the game. However on Wednesday, the Orioles shut him down from catching for at least a week.
Showalter said that if Wieters is unable to catch the team's opening game on April 6 at Tampa Bay, he would not be on the roster as a designated hitter.
The Baltimore manager said that Wieters' recovery is going well, and this shouldn't be viewed as a setback.
Caleb Joseph is likely to start the season as the Orioles catcher if Wieters is unavailable.