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6/9/2013 5:22 P.M. ET

MRI shows Kratz tore left meniscus

Recovery time not known until catcher undergoes surgery on knee

MINNEAPOLIS -- Erik Kratz needed crutches to get through the Phillies clubhouse Saturday night at Miller Park.

It looked bad, and it is. A MRI exam Monday in Philadelphia revealed Kratz tore the meniscus in his left knee, which will require surgery. A recovery time will not be known until after the surgery. The Phillies placed Kratz on the 15-day disabled list Sunday.

He injured the knee running past first base in the ninth inning of Saturday's 4-3 loss to the Brewers.

The Phillies called up Steven Lerud from Triple-A Lehigh Valley to take his place on the 25-man roster.

The Phillies can only hope Carlos Ruiz returns soon. He has been on the disabled list since May 20 with a strained right hamstring. Ruiz said he plans to do a little more work in Minnesota this week before possibly heading to Triple-A Lehigh Valley to begin a rehab assignment by the weekend.

He still hopes to be back before the Phillies open a homestand June 17 against the Nationals.

"Yeah, that's my goal," he said. "I want to be back."

Kratz is second on the Phillies with eight home runs and fourth with 22 RBIs. He also is fifth among all catchers in baseball in homers.

Brown continues to tear cover off ball

MILWAUKEE -- Domonic Brown has been on quite a tear lately.

He hit his 17th home run in his last 39 games Saturday in a 4-3 loss to the Brewers at Miller Park. The last Phillies player to hit 17 or more home runs in a single-season span of 40 games? That would be Raul Ibanez, who hit 17 in 40 games from April 8 to May 24, 2009.

Brown entered Sunday's series finale against the Brewers leading the National League with 19 home runs. He also ranked third in the league with 47 RBIs, 136 total bases and a .604 slugging percentage.

Manuel continues to be cautious with Adams

MILWAUKEE -- Phillies setup man Mike Adams has been unavailable to pitch recently because of soreness in his right biceps.

Adams said after Sunday's 9-1 loss to the Brewers at Miller Park he was available to pitch, if he had been needed. But Phillies manager Charlie Manuel thought otherwise.

"No, I don't think so," Manuel said. "No."

Bullpen struggles still an issue for Phillies

MILWAUKEE -- The Phillies bullpen entered Sunday with a 4.39 ERA, which was third-worst in baseball.

It continued its struggles Sunday in a 9-1 loss to the Brewers. Phillies left-hander Jeremy Horst put a couple runners on in the seventh, and Justin De Fratus allowed them to score to make it 8-0. Jonathan Papelbon, who has been the bullpen's lone bright spot since the beginning of the season, allowed a solo homer in the eighth.

Horst is tied for the team lead with 26 appearances. He also has a 5.55 ERA.

"I think that we have to use him, and also I want to," Phillies manager Charlie Manuel said of Horst. "He's very capable of doing the job for you. Sometimes it's a matter of circumstances that he's got where he's at. Sometimes staying with him helps, too. He kind of showed us last year what he could do. And he's showed you at times now that … he's had some good outings sometimes."

Worth noting

• The Phillies entered Sunday's series finale against Milwaukee having homered in 13 consecutive games. It is their longest streak since they homered 18 consecutive games Sept. 3-22, 2008. The Phillies are 7-6 in their current stretch.

• Left-hander John Lannan will make a rehab start Wednesday with Double-A Reading as he recovers from a left knee injury. It will be his second rehab start.

Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.