Cueto left Friday nights game in the second inning after showing signs of aggravating his lat injury.
Tony Cingrani, who had been placed in the bullpen following Cueto's last return from the disabled list, is expected to take his place in the rotation.
Cueto may have to change up his mechanics while rehabbing. It is unclear how long he will be sideline but sources point towards upwards of three weeks before returning.
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