Blue Jays pitcher Miguel Castro left Friday's start for Triple-A Buffalo with some type of injury.

Castro was sent down earlier this season and is using his time with Buffalo getting stretched out to convert from the bullpen to the rotation.

He gestured to the dugout in the second inning, after throwing his 44th pitch of the game. After meeting with trainers on the mound, he left the game.

The team later announced that he left with tightness in his forearm.