Fellow left-hander Brian Duensing will start on Sunday, but Saturday's starter is still to be determined. It's expected to be either right-hander Cole De Vries or right-hander Sam Deduno.
"We'll figure out the rotation," Twins manager Ron Gardenhire said. "We'll slot them down the road."
Left-hander Scott Diamond is likely to start the fourth game after the break against the Orioles on Monday. The Twins are trying to give Diamond, who started Thursday, a bit of a break because he's already logged a combined 113 2/3 innings in Triple-A and with the Twins.
"He's thrown a lot of innings so we'll give him that extra break," Twins assistant general manager Rob Antony said. "Somebody is going to go 10-12 days in between starts so I think they believe it can be a benefit to him and won't hurt him."