Devin Mesoraco is sidelined indefinitely because of a mild concussion that he suffered when a foul ball hit him on the mask.

The Cincinnati Reds catcher is being tested daily and is confined to riding a stationary bicycle and walking on a treadmill to stay in shape.

"It is tough for me to sit around, but that's what you have to do," Mesoraco said. "Right now I want to get back to work and I can't do it. I did 20 minutes on the bike today. Tomorrow, I'll walk on the treadmill."

It's his third concussion as a professional.