Cincinnati Reds closer Aroldis Chapman, awake and alert Thursday morning after being hit in the face, suffered a mild concussion and is undergoing surgery Thursday to replace a broken bone above his left eye, and is expected to be sidelined six to eight weeks, Reds team physician Timothy Kremchek said.

Chapman will have a permanent titanium plate, and perhaps a bone graft, to repair the broken bone, but otherwise, Kremchek said that Chapman should be fine.

"Right now, he's a very lucky guy,'' Kremchek said. "He's awake and alert and knows what's going on. There's no other brain injuries. Hopefully, a couple of weeks he can start exercising, and start throwing. And hopefully, be back in six to eight weeks.

"The problem is you don't want to get him back to contact as a pitcher too soon.''