Keller was removed from Saturday's Grapefruit League game against the Tigers after he was hit in the right thigh by a comebacker in the top of the second inning, Kevin Gorman of TribLive.com reports.
Keller tossed 18 pitches prior to his departure and allowed two hits and no walks while striking out one in 1.2 innings. He likely wouldn't have pitched much longer even if he wasn't hit by a comebacker, and it's not clear whether his thigh injury will impact his training regimen during camp.