Omar Infante was hit in the face by a pitch from Heath Bell during Monday night's game between the Kansas City Royals and Tampa Bay Rays.
Infante immediately left the game in the seventh inning, walking off under his own power.
Hit in the left cheek, he was spitting blood and had blood on his forehead as trainers held a towel to his face.
The Kansas City Star reported that Infante was taken to the hospital.
"They put a number of stitches in there to close the cut," Ned Yost said. "They are going to go scan it and see if his jaw is fractured. We'll know more later. I'm not going to make any decisions (on roster moves) until we find out what's going on with Omar and we'll move forward from there.
"He was bleeding tremendously from the cut. I didn't know until they had taken him upstairs that he got hit on the jaw. When we got there they had the towel (over his head) and there was blood all down his shirt. There was no cut on his forehead that I could see."