With two games scheduled for Thursday, the Twins tried to gather as many healthy players as possible.
Outfielder Delmon Young went on the 15-day disabled list because of a strained left oblique muscle. Outfielder Rene Tosoni was called up from Class AAA Rochester to replace him.
After pitching 3 1/3 innings on Wednesday, righthander Eric Hacker was optioned to Rochester, and righthander Anthony Swarzak was called up to start the second game Thursday.
Young, out of the lineup since April 18, felt tightness in his side before Wednesday's game.
"He tried to swing," Twins manager Ron Gardenhire said. "He was swinging in batting practice, but he never could get loose. Said it was too cold, he didn't feel right, didn't feel loose. There was no soreness.
"I told him, 'I have to put you on the DL.' He said that was the right thing to do."
It's the first time that Young has been on the disabled list in his career. The move is retroactive to April 19, so Young can be activated before the Twins open a series at Boston on May 6.
Tosoni, 25 was batting .286 with three homers and 16 RBI in 18 games. This will be his first taste of the majors.
The Twins hoped Hacker could start the second game Thursday, but that was before he relieved Francisco Liriano in the fourth inning Wednesday. The Twins needed a starter, so Swarzak was called up. Swarzak, who was 3-7 with a 6.25 ERA in 12 starts with the Twins in 2009, is 1-1 with a 4.87 ERA at Rochester.
Swarzak is coming off a shaky outing on Sunday against Pawtucket. In that game, he gave up seven runs over 4 2/3 innings on eight hits.
The Twins could have used Scott Baker on Thursday but elected to push Baker to Friday and go with Swarzak. There's a chance that righthander Kevin Slowey, who is coming back from bursitis in his shoulder, could be ready to return by Saturday.
Concerns about Thome
The Twins might still be shorthanded Thursday. Gardenhire is worried that slugger Jim Thome needs more time to recover from a slightly strained left oblique muscle.
"He told me he still feels it, and I don't think there's any chance,'' Gardenhire said. "I don't think it is a DL thing -- that's what Thome told me, he says a couple days and he will be fine.''
Thome said he felt something in his side on his last swing during Sunday's game against Cleveland. "But it's been getting better ever since,'' he said.
"My plan is to be ready [Thursday] for sure.''
More rotation fluctuation
Twins righthander Carl Pavano has the flu. He was scheduled to start on Saturday but will now start on Sunday in Kansas City.
"There's a bunch of guys sniffling and coughing in there, but the weather is conducive for that,'' Gardenhire said. "He was going to do a little bit of work [at the park] and then head to the house. We talked to him about his options. Sunday sounded great.''
The pushed-back Baker, lefthander Brian Duensing and Pavano will face the Royals in Kansas City.
• Slowey threw 47 pitches during an extended spring training game on Wednesday and is expected to rejoin the club during its upcoming road trip.
• In non-injury news, voting has started for the 2011 All-Star Game, to be played July 12 in Phoenix. All Twins starters are on the ballot, with Jason Kubel listed as a designated hitter. Thome is not on the ballot.