Wimmers pitched two-thirds of an inning in the Gulf Coast League on July 23 in his attempt to come back from a strained elbow.
But it didn't go well, according to Twins general manager Terry Ryan. Ryan, though, wouldn't speculate that Wimmers needs Tommy John surgery just yet.
"I haven't gotten that type of information," Ryan said. "I'm not going to predict that. I don't know if that's accurate or not. Whoever you heard that from, it might be, I don't know. He wouldn't be coming up here if it was any good. It's something we think is serious enough for our people to see him here local, again. I don't know exactly the extent of this thing, but obviously, it's something we're concerned about, because we're going to fly him up here again. He's just not responding."