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6/16/2013 2:18 P.M. ET

Willingham gets cortisone shot, eyes Tuesday return

MINNEAPOLIS -- Left fielder Josh Willingham had a cortisone shot in his left knee on Saturday night and was held out of the lineup on Sunday, but is hoping to return on Tuesday after the Twins' off-day on Monday.

Willingham said he's not sure when he first injured his knee, but it has been bothering him all season. He was limited to designated hitter duty this week -- he hasn't played left field since June 9 -- and also missed Saturday's game.

"It's been aggravating me all year," Willingham said. "I don't know why or when it started. It affects my ability to run, which affects my defense. Not that I'm a Gold Glover, we all know that I'm not, but I can't be the best I can be because it hurts to run, so I wanted to get it knocked out with the medicine in there and hopefully play Tuesday."

It's the first time Willingham has received a cortisone shot, so he admitted he's not sure if he'll be limited to designated hitter duty in the short-term once he returns.

"I don't know," Willingham said. "I don't know how well the medicine will work. So we'll just have to play it by ear, day by day."

With Willingham out, rookie Oswaldo Arcia made his second straight start in left field.

Ramirez to begin rehab assignment this week

MINNEAPOLIS -- Outfielder Wilkin Ramirez, on the 7-day concussion disabled list since May 26, left for Fort Myers, Fla., on Sunday and is expected to officially begin a rehab assignment this week.

Ramirez is scheduled to work out in Fort Myers in the minicamp held for recent Draftees now that extended Spring Training is over. If all goes well, Ramirez will go on a rehab assignment with Class A Advanced Fort Myers this week.

"Once we deem him ready, we'll shift him across the street with the Miracle on an official rehab," Twins general manager Terry Ryan said. "So he's about ready to go full-bore here, so we'll get him going down there in Florida and get him in some games."

Ramirez suffered the concussion while running into left fielder Josh Willingham while trying to catch a fly ball on May 25 in Detroit.

Twins host Father's Day festivities at Target Field

MINNEAPOLIS -- The Twins held festivities for Father's Day on Sunday at Target Field, highlighted by Justin Morneau hosting 25 veterans and their children for a game of catch on the field before the game.

It was the final event of Hope Week, which featured 10 events that helped out several local charities with many of the events coming as a surprise to the recipients.

Sunday was also the final day of the Prostate Cancer Foundation Home Run Challenge. Starting on June 9, the Twins pledged $10,000 for every homer hit by a Twins player and $1,000 for every strikeout recorded by a Twins pitcher. Entering Sunday's game, the Twins had donated $54,000 to the Prostate Cancer Foundation

Twins right-hander P.J. Walters, who started on Sunday against the Tigers, pledged an additional $1,000 for every strikeout he recorded during the game.

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.