The Chicago Cubs placed catcher Yan Gomes on the seven-day concussion injured list on Wednesday.
The move is retroactive to Tuesday.
Gomes was hit in the back of the head by a backswing while catching during Monday's game against the Washington Nationals. He departed in the second inning and was replaced by Tucker Barnhart, who started Tuesday and Wednesday against the Nationals.
In a corresponding move, the Cubs recalled right-hander Javier Assad from Triple-A Iowa. Chicago had called up Miguel Amaya from Double-A Tennessee on Tuesday to serve as a reserve catcher.