The Kansas City Royals lost their second baseman midway through Tuesday's series opener against the Toronto Blue Jays.
Michael Massey was forced to exit in the bottom of the fifth inning after fielding a ground ball off the bat of Nathan Lukes and hitting his head on the turf as he fell to the ground after making the throw.
The 28-year-old was visited by team training staff on the field before walking off under his own power.
Kansas City later announced that Massey left due to the head impact, but added that he is doing well.
Tyler Tolbert entered to take over in Massey's place.
Massey was 0-for-2 with a walk against Blue Jays starter Max Scherzer through three trips to the plate on Tuesday.
He entered the contest slashing .275/.307/.444 with 11 home runs and 22 doubles on the season.
A fourth-round pick of the Royals in 2019, Massey is in the midst of a particularly hot August. Over his first 18 games of the month, he posted a .904 OPS.
