Caleb Thielbar left Chicago’s Thursday win over the Cubs in the ninth inning with an apparent leg injury.

Cubs broadcasters speculated it could be a hamstring the way he was holding it. Thielbar, working as the closer a night after Ben Brown went 37 pitches, gave up a game-tying homer to Adolis Garcia before suffering the injury. The Cubs eventually won in extra innings. If Thielbar misses time — and the Cubs remain committed to Brown as a multi-inning man — we could see a very desperate-feeling closer by committee on the north side.