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5/15/2014 1:47 P.M. ET

Red Sox looking to get Mujica turned around

MINNEAPOLIS -- The Red Sox had high hopes for setup man Edward Mujica when they signed him back in December to a two-year, $9.5 million contract.

Thus far, they've had a hard time getting the righty going.

Mujica has pitched in 13 games for the Red Sox, posting a 9.00 ERA. Opponents are hitting .340 against him.

Last week, the righty was slowed for a few days by tenderness in his right oblique.

"It's two outings, I think, in about a two-week span," said Red Sox manager John Farrell. "I temper it with ... he needs a little bit more frequent work. I don't necessarily see any restrictions physically after he felt something in the oblique. Still, he's a guy that's had a lot of success and we have to get him going."

Though Mujica was certainly in the running to be Boston's primary setup man, he was shaky out of the gate and Junichi Tazawa and Andrew Miller have been getting most of the high-leverage outs in front of closer Koji Uehara.

"I know he can be a little bit frustrated with the infrequency of use and the way things have gone to date," said Farrell. "We've got to get him a little more active and we've got to get him a little more consistent with overall location."

Sizemore, Victorino sit vs. Twins in finale

MINNEAPOLIS -- With a 1 p.m. ET start on Thursday following a night game, Red Sox manager John Farrell rested left fielder Grady Sizemore and right fielder Shane Victorino.

Mike Carp got the start in left, with Jonny Gomes playing right.

Though Sizemore has passed every physical test to date, the Red Sox feel no need to push it at this point.

"With Grady's situation, knowing we've got three right-handed starters coming up on the weekend [against the Tigers], a day of rest is to balance the things we still factor in with him," said Farrell.

There will probably come a time later in the season when Sizemore will start in this type of scheduling circumstance.

"He could have gone today. There's no doubt he was capable. To say that he's up to six or seven games a week, I think that's conceivable at this point," Farrell said. "Where we've come over the last six weeks is drastically different than coming out of Spring Training, where we had to balance a number of games per week. In my mind, there's probably no restrictions at this point."

Victorino banged his left knee sliding into third on Tuesday, making this a good opportunity for Farrell to get him a blow.

And it was also a chance to get Carp, an invaluable contributor last season, into the lineup.

Carp is off to a slow start this season, hitting .243 with no homers and two RBIs. This was his ninth start in 40 games this season.

"The role Mike is in is one that's similar to a year ago. It's not an easy role," said Farrell. "I know that he views himself as more of an everyday type of player. We're conscious of that. We're trying to keep him as sharp as possible. As much as we can, we continue to communicate with him and keep him engaged as much as possible without being in the lineup every day. I compliment him for the way he goes about his work."

Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.