Steele was removed from Friday's Cactus League start versus the Giants after being hit in the left knee by a comebacker, Marquee Sports Network reports.
Steele stayed down on the ground for a bit after being struck by a ball off the bat of Luis Matos before eventually walking off the field with a limp. It's not clear at this point whether the southpaw will need to undergo any testing. Steele was making his final tune-up start before his scheduled Opening Day assignment March 28 against the Rangers.