© 2013 MLB Advanced Media, L.P. All rights reserved.

6/28/2013 9:20 P.M. ET

Mastroianni taking BP, doing light activities

MINNEAPOLIS -- After weeks of hobbling around the Twins' clubhouse on crutches or in a walking boot, Darin Mastroianni has started taking early batting practice in addition to some other light activities.

The outfielder underwent surgery earlier this season to repair a bone chip in his left ankle. He saw action in only eight games through April for the Twins.

With the cast finally off, Mastroianni took early batting practice on Thursday and Friday and started some running on Friday as well.

"From where he was when went we went on the last road trip, night and day," Twins manager Ron Gardenhire said. "He's got spikes on now and he's coming along pretty good. We still think it's going to be three weeks to a month, but that's all going to be dependent on how he feels. It could go faster and it could go slower if he has any setbacks."

Twins general manager Terry Ryan said it sounds like Mastroianni is probably ahead of schedule, but also said he's not ready to talk about the outfielder rejoining the team just yet.

"He's a good worker," Ryan said. "You don't have to worry about him putting the effort in because he's here and he works. So he's making progress."

Doumit returns behind plate against Royals

MINNEAPOLIS -- One day after Ryan Doumit was reported to be available to the Twins if needed, the catcher was back in the lineup.

Doumit sprained his right ankle on Sunday at Cleveland in the ninth inning. On Friday, the switch-hitter batted third behind Joe Mauer, who was given DH duties with Doumit back behind the plate.

"The trainers came in and said catching would probably be the best place for him," manager Ron Gardenhire said. "There you have it. I'll listen to the trainers and we'll catch him."

Going into Friday's game against the Royals, Doumit was batting .237 with 56 hits and 35 RBIs.

Pelfrey set for rehab assignment on Monday

MINNEAPOLIS -- Twins right-hander Mike Pelfrey is already on the mend.

The starter missed his last turn on Sunday and was placed on the 15-day disabled list with a sore back.

According to general manager Terry Ryan, Pelfrey will go on a rehab assignment on Monday with Class A Cedar Rapids.

"We've got a nice plan for him," manager Ron Gardenhire said. "He's going to definitely pitch somewhere and eventually get activated and make his start, probably by like next Saturday."

Pelfrey has noted multiple times that he isn't incredibly patient when it comes to recovering from injuries -- in particular, his Tommy John surgery over a year ago while with the Mets.

Pelfrey is 3-6 this season with a 6.11 ERA in 70 2/3 innings. He has turned in only one seven-inning outing so far, but was progressing and starting to find some consistency on the mound prior to heading to the DL.

Twins sign second-round Draft pick Slegers

MINNEAPOLIS -- The Twins announced on Friday the signing of fifth-round Draft pick pitcher Aaron Slegers.

Slegers was at Target Field a day earlier to watch Thursday's matchup with the Royals. At the time, general manager Terry Ryan noted they were just waiting on the results of Slegers' medical, but noted they had reached an agreement with the right-hander.

"Slegers is signed and he's on his way to [Rookie League] Elizabethton," Ryan said.

Slegers, who is 6-foot-9, 250-pounds, was 9-2 with a 2.04 ERA in 18 starts at Indiana University.

The Twins also signed their second-round pick, pitcher Ryan Eades out of LSU, earlier this week. Eades struck out 78 in 100 innings and posted a 2.79 ERA for the Tigers. The 6-foot-2, 195-pound right hander also logged an 8-1 record.

Minnesota has now come to terms with 26 of its 40 picks. Of the 26 signings, 24 are among the club's top 25 picks.

Kelly Erickson is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.