San Francisco Giants catcher Buster Posey left Friday's game against the Arizona Diamondbacks at Chase Field with an apparent head injury.
Per NBC Sports Bay Area's Alex Pavlovic, Posey was removed in the third inning after recording a single. He took a foul ball off his catcher's mask during the first inning.
The Athletic's Andrew Baggarly noted it was possible Posey experienced symptoms after running down the first-base line prior to his exit.
The 31-year-old became an All-Star for the sixth time in 2018, though he didn't represent the National League in the All-Star Game itself.