It was a scary moment for Sizemore, who was deemed day-to-day following X-rays that proved negative.
The A's third baseman squared up to bunt against Tigers right-hander Rick Porcello and, after being hit, was seen bent over for several minutes, with manager Bob Melvin and the team's head trainer by his side before departing the game.
"I saw it was a fastball right away, but it didn't click in my head to get away right away," Sizemore said. "When you're bunting, when you want to get it down, you kinda gotta stick your nose in there, and the ball was just tracking me. It tailed up and in, I was able to get my face out of the way, but it still squared me up right on the jaw and neck."
Sizemore was understandably sore following the game and noted he was limited when turning his head, but he believes the injury won't keep him out of the lineup too long. Manager Bob Melvin was also unsure of a timetable for his return, as much will depend on how Sizemore feels Wednesday, but said, "I'm guessing he's not going to be able to play tomorrow."
"When you're bunting, you get out there, and if it's a breaking ball you gotta hang in there, and the next thing you know it's up under you like that," Melvin said. "We're glad there was no fracture."
Eric Sogard, called up from Triple-A on Friday, ran for Sizemore at first base and took over at third base in the bottom half of the frame, where he'll likely start while Sizemore is out.