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8/8/2013 12:25 A.M. ET

Hendriks slated to start in twin bill with Sox

KANSAS CITY -- As expected, right-hander Liam Hendriks will be recalled from Triple-A Rochester to start Game 2 of Friday's doubleheader against the White Sox at U.S. Cellular Field.

It'll be the third start with the Twins this year for Hendriks, who made the Opening Day roster and had a 4.66 ERA in two starts before being optioned to Triple-A. Hendriks posted a 5.12 ERA in 14 starts with Rochester, but he has fared better recently with a 4.10 ERA over his last eight outings.

"He's been the most consistent," Twins assistant general manager Rob Antony said. "He wasn't very good his last start, but six of his last eight have been pretty good. So, he was the logical guy. He's been up here before. And we don't have a lot of options to be honest. But he's been pitching better."

The Twins won't need to make a corresponding move, as both teams will have a 26th player available to them, per MLB's Collective Bargaining Agreement, because of the doubleheader. Rookie right-hander Kyle Gibson will start the first game of the twin bill.

Doumit exits with concussion-like symptoms

KANSAS CITY -- Twins catcher Ryan Doumit left Wednesday night's 5-2 loss to the Royals with concussion-like symptoms, and is expected to be placed on the seven-day concussion disabled list, according to assistant general manager Rob Antony.

Doumit said he initially sustained the injury when he took a foul tip off his facemask in the ninth inning on Sunday with Astros catcher Jason Castro at the plate. He said he felt nauseous on the plane ride to Kansas City on Sunday, but didn't think anything of it and didn't tell anyone.

Doumit served as designated hitter in Monday's 13-0 loss, going 1-for-3 with a double, and started at catcher on Wednesday after a day off. But he started to feel nauseous during the game and was replaced by Chris Herrmann behind the plate to start the bottom of the fourth inning with right-hander Samuel Deduno on the mound.

Doumit was then examined by a Kansas City doctor at the ballpark, who ruled that Doumit had symptoms consistent with a concussion.

"We're going to evaluate and check him, but the doctor here in Kansas City said he has concussion symptoms so we'll keep an eye, but I'd say there's a high probability he's going on the DL," Antony said.

Doumit, who went 1-for-2 with a single against Royals left-hander Danny Duffy before being replaced, said he hopes to stay off the seven-day DL. He said he's sustained several concussions before and hopes he'll better after an off-day on Thursday. But as Antony noted, it's very likely he'll be placed on the DL.

"I talked to the doctor and he said those are symptoms consistent with a concussion, but I'm not ready to say that yet," Doumit said. "The true test will be Friday when I can go out and do some physical activity."

With Doumit likely headed to the DL, the Twins are now expected to activate outfielder Josh Willingham from the DL in time for Friday's doubleheader against the White Sox. Willingham was scheduled to fly in Friday, but will now leave his rehab assignment with Triple-A Rochester a day earlier than expected to join the team on Thursday in Chicago.

Twins' Wood to have season-ending surgery

KANSAS CITY -- Reliever Tim Wood, who hasn't pitched for the Twins this season while battling shoulder injuries, will have season-ending arthroscopic surgery on his right shoulder on Aug. 22. The operation will be performed by Dr. Anthony Romeo in Chicago.

Wood, who signed a $675,000 contract with the Twins before the season, initially sustained a right rotator cuff strain in Spring Training and began the year on the 15-day disabled list. He rehabbed at both Class A Advanced Fort Myers and Triple-A Rochester, combining to post an 8.68 ERA in nine games.

The surgery will repair the front of Wood's shoulder, specifically his labrum, according to Twins assistant general manager Rob Antony.

"He just said he still had pain in the front of his shoulder," Antony said. "He just wasn't feeling comfortable throwing. He'll do a pre-op in Fort Myers, and then he'll fly into Chicago and have the surgery and rehab in Fort Myers. You won't see him in a Twins uni this year."

The Twins hoped Wood could carry over his success from Triple-A, as he was named the International League pitcher of the year in 2011 and '12 by Baseball America while pitching in Pittsburgh's organization. But it turns out he won't even throw a single pitch for the Twins this season and is set to be a free agent after the year.

"I believe he wanted to pitch," Antony said. "He was very upset in spring when he got hurt and was trying to make the team. He was disappointed. He had a great year at Triple-A last year and he wanted to capitalize on it. So it's just one of those unfortunate things. Injuries are a tough thing."

Mauer gets planned day off; Florimon returns

KANSAS CITY -- Twins catcher Joe Mauer was held out of the starting lineup in a planned move on Wednesday night against the Royals, giving Ryan Doumit the start behind the plate in the series finale at Kauffman Stadium.

But Mauer came in as a pinch-hitter in the ninth inning and singled to left field against Royals closer Greg Holland in a 5-2 loss, and Doumit left the game in the fourth inning due to concussion-like symptoms. Chris Herrmann finished the game behind the plate for Doumit, who is expected to be placed on the seven-day concussion list.

Mauer had played every day since coming off the restricted list on July 30 after missing six games to attend the births of his twin daughters. Mauer ranks second on the team in games played this year with 100, trailing only first baseman Justin Morneau, who played in his 105th game on Wednesday.

"We had talked about this way back once we got on the road," manager Ron Gardenhire said. "I didn't want to give him a day off at home. People get excited. We need to give him a break here and this will give him back-to-back [with Thursday's off-day]."

So while Mauer was out of the lineup, shortstop Pedro Florimon made his return after missing four games with inflammation in his left wrist. He took batting practice from both sides of the plate with no issues before Tuesday's game and was cleared by team doctors to make his return.

"Everything went good," Twins assistant general manager Rob Antony said. "He's in the lineup. He could've played last night. He felt good but we just didn't use him."

Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.