CHICAGO -- Brewers right-hander Marco Estrada said he still has a few things to work on before returning from the 15-day disabled list for his scheduled start on Tuesday.

"I'm not 100 percent, but I'm pretty close," Estrada said. "Pitching-wise, my leg doesn't affect me at all. Just mentally and maybe a release point I have to work on or the windup, I still feel a little out of whack. It's not too bad."

A right quadriceps strain has kept Estrada out of action since May 23. He stressed that he shouldn't have any problem making his start or feeling comfortable pitching or fielding by game time on Tuesday.

"If people want to try to bunt on me, go ahead, because I'm able to get to everything," he said.

Estrada was nearly perfect in two rehab starts at Triple-A Nashville, throwing three scoreless innings June 16 and allowing one run in five innings on June 21.

"I talked to him and he said the first night he really didn't feel that bad, he was just missing off the plate a little bit," said manager Ron Roenicke. "The last start he said he felt really good."

Marcum replaces Ishikawa on disabled list

CHICAGO -- Brewers right-hander Shaun Marcum was placed on the 15-day disabled list with right elbow tightness, while first baseman Travis Ishikawa was reinstated from the DL and joined the team before Saturday's game against the White Sox.

Ishikawa, who had been sidelined since May 27 with a left oblique strain, said he is near 100 percent after six games with Triple-A Nashville.

"I was just counting down the days to be back," Ishikawa said. "I was feeling pretty good down there and seeing a couple games on TV made me want to get back that much quicker."

Ishikawa said he didn't have any setbacks and was able to play without any hesitation or apprehension, even while swinging, which he said is the hardest part when returning from an oblique injury.

"You can feel a little bit of tightness there with certain swings," he said. "Everybody I've talked to that's had this injury said you're going to feel a little bit of tightness. But it's not the grabbing, it's not the sharp pain I was feeling before. I played a week's worth of games down there with 100 percent intensity."

Brewers manager Ron Roenicke said he's not sure what the exact plan is yet for Marcum, though he expects the starter to return June 30 or July 1, having him miss just two starts since the injury.

"The feeling was we would have to push him to that start, and we didn't know if we wanted to do that," Roenicke said.

Brewers sign Puerto Rican pitching prospect

CHICAGO -- The showcase hosted by Major League Baseball for Puerto Rican players who weren't selected in the 2012 First-Year Player Draft on June 12-13 at the Roberto Clemente Walker Stadium in Carolina, Puerto Rico, benefitted the Brewers.

Milwaukee signed right-handed pitcher Joshua Torres out of the showcase, joining the Cardinals, Rangers and Rockies as one of four teams to sign a player from the showcase. Torres is a teenage prospect who projects as a top-of-the-rotation pitcher.

Fourteen-year Major League infielder and three-time All-Star Carlos Baerga, a Puerto Rican native, attended the event and addressed the players. The showcase provided undrafted, unsigned players with additional exposure before MLB scouts and coaches.

"By coordinating scouting opportunities for these aspiring players, we hope to provide additional avenues for young Puerto Rican players who wish to play professionally," said Kim Ng, MLB's senior vice president of baseball operations.

Worth noting

• Brewers general manager Doug Melvin was inducted into the Canadian Baseball Hall of Fame on Saturday.

• Manager Ron Roenicke said he's having a difficult time trying to decide whether to put Corey Hart back in right field or keep him at first base.

"I like him so much at first, and I think everybody does, that we wanted to keep him there," Roenicke said. "Every night he's doing something good there."