Carlos Frias exits Triple-A start after one inning.

PHILADELPHIA — Pitcher Carlos Frias experienced a back issue during his latest start for Triple-A Oklahoma City on Wednesday night and was removed after one inning as a precaution.

Frias was making his third start for the Dodgers’ top affiliate since he was placed on the 15-day disabled list July 1.

Curiously, the Dodgers did not announce that Frias had been activated from the 15-day disabled list and optioned to Oklahoma City at the time it happened. According to the transactions page on the team’s website, Frias was optioned Sunday.

So, the right-hander had been medically cleared to rejoin the Dodgers when he took the mound Wednesday night. That makes the latest setback at least somewhat more surprising.

Mike Bolsinger was removed from his start for Oklahoma City on Tuesday because he was struck on the forearm by a line drive. He’s expected to make his next start. Frias and Bolsinger are currently the team’s sixth and seventh starters.

Carlos Frias isn’t guaranteed a spot in the Dodgers’ rotation when he returns.

Carlos FriasNEW YORK — Carlos Frias is scheduled to throw 50 pitches today for Single-A Rancho Cucamonga, his first minor league rehab appearance since he was sidelined with back stiffness earlier this month.

Frias was in the Dodgers’ starting rotation when he suffered the injury, but he is not guaranteed of going back into the rotation when he returns.

“It could be anywhere,” manager Don Mattingly said. “It could be in the rotation, it could be in the bullpen. You never know where Carlos could end up.”

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