Oliveros, who was at Triple-A Rochester, has been plagued by elbow issues this season and will have the surgery at some point in the next two weeks. The recovery time is about 10-12 weeks, according to Antony.
"He came back and was throwing the ball well but it was barking on him," Antony said. "But this is one where rather than have him go through the year with it, we just want him to take care of it now. Our goal is to get him healthy by the end of the year. I don't think we'll be looking at winter ball. If we do, just the second half to get ready for Spring Training."
Oliveros, 24, posted a combined 2.42 ERA with 51 strikeouts in 48 1/3 innings split between Double-A New Britain and Triple-A Rochester this season. He also made one appearance for the Twins, giving up one run in 1 2/3 innings against the Phillies on June 14.
"He had some pretty good stretches there," Antony said. "It's disappointing, he could have been a guy that, if he had been healthy, he could have been a guy that could have been up here and had a chance to pitch out of the bullpen. He was throwing the ball very well."