"I did talk to him on the plane last night," Leyland told reporters before the Tigers' workout at Comerica Park, "and he seemed fine. He's a little sore, but there didn't appear to be anything that looked alarming like loss of memory.
"He looked fine, his eyes looked fine, and the trainers have checked him out, so I think he's fine."
That lines up with what Fister told reporters after the Tigers' 2-0 loss. The concern with such injuries is some symptoms aren't immediately apparent. When Alex Avila collided with Prince Fielder chasing a foul ball last month in Cleveland, for instance, he felt ill moving around for several days afterwards before feeling comfortable enough to play.
Avila's collision was more on the side of his head. Fister took the brunt of Gregor Blanco's liner off the back of his head.
Fister is currently lined up to pitch Game 6 if the Tigers win at least two out of the next three games to send the series back to San Francisco.