MINNEAPOLIS -- Right-hander Michael Pineda, who was on track to be a September callup after last year's Tommy John surgery, returned from his rehab assignment with Triple-A Rochester on Sunday after he felt discomfort in his knee while throwing his latest bullpen session and will be checked out by Twins doctors.
Pineda had made four rehab appearances (three starts) between the Gulf Coast League Twins, Class A Advanced Fort Myers and Triple-A Rochester, posting a 1.50 ERA with nine strikeouts and three walks in 12 innings. He was scheduled to start again on Sunday with Rochester but returned to the Twin Cities instead.