PHOENIX -- Twenty-one-year-old Wily Peralta will start again for the Brewers on Friday, and his chances look better than ever to be the first man to fill in for the injured Zack Greinke.

The Brewers were originally eyeing three young right-handers on the 40-man roster to start April 6 against the Braves, the first time they'll need a fifth starter to step in. But with Amaury Rivas and Mark Rogers optioned back to the Minors, Peralta has a clear path to the assignment.

The Brewers will also consider some non-roster pitchers, including Eulogio De La Cruz and Marco Estrada.

"Nobody wants anyone to get hurt, but I'll just do what I know how to do out there, and they'll make the decision on giving me the opportunity," Peralta said. "I know there are a lot of us here that could be given the opportunity, and I'll just do my job.

"I'd be very happy to be in the Majors [to start the season], that's everyone's goal. You come here with the purpose of being in the Majors."

The Brewers tentatively need a fifth starter April 6, 16 and 26, and could use a combination of players in that role.

Brewers manager Ron Roenicke was very impressed with Peralta's live batting practice last month. Now he'd like to see that guy in a game.

"I don't know if he's amped up and he wants to show everybody," said Roenicke, who has not seen the same command from Peralta in games. "I don't know. It's hard to tell. If he was, I can't blame him. He wants to show us something, and he's just not locating his pitches."

Said Peralta: "I think I'm going to give my best stuff. The previous games, you know, my mechanics [were off], but I feel good now and I think I'm going to give my best stuff."

Opening Day in question for injured Parra

PHOENIX -- Balky-backed Brewers reliever Manny Parra had a setback earlier this week and could miss the start of the regular season, manager Ron Roenicke said Thursday.

Parra received a cortisone injection after feeling discomfort in a bullpen session on Tuesday and will need to restart a throwing program when he resumes activity, on Saturday at the earliest. That would leave only 12 days to prepare for the team's March 31 Opening Day in Cincinnati.

"Just looking at the calendar, I don't know if Manny is going to be ready for the season," Roenicke said. "We're running out of time."

Parra has faced only one batter plus one pitch to a second this spring because of tightness in the middle of his back. It's a common spring problem for the 28-year-old that usually subsides. This year, it did not.

He didn't want to make a guess about his availability for Opening Day.

"I don't even ask those questions," Parra said. "All I know is that I go out and throw and everything feels so good, except for my back. There have been a lot of positives this spring for me. Nobody gets to see that because it's all happening on the back field."

The Brewers had Parra penciled in as their long reliever, and his setback coupled with Zach Braddock's Spring Training funk has created an opening for another left-hander, Mitch Stetter, a side-arming specialist who pitched 71 games for the Brewers in 2009 but was relegated to Triple-A Nashville for most of 2010.

Stetter was scheduled to appear in Thursday's game against the White Sox, and Roenicke is intrigued by the reports he's received from Brewers coaches and club officials.

"They say he made really good left-handers look really bad," Roenicke said.

Roenicke looking to get gang all together

PHOENIX -- Milwaukee manager Ron Roenicke is anxious to get his starting position players on the field at the same time, but injuries have made that difficult.

Center fielder Carlos Gomez returned Thursday from missing three games with a stiff back, and shortstop Yuniesky Betancourt was feeling good, according to Roenicke, a day after returning to the lineup from two days with a sore right thigh. Left fielder Ryan Braun (ribs) and second baseman Rickie Weeks (groin) appear to be past their own minor setbacks.

"With two weeks to go, we need to start tightening up what we're doing," Roenicke said. "The lineup is a big part of it, the infield being together playing on the same field is important. Hopefully, health-wise, we'll be allowed to do a little more of that."

Weeks and Betancourt, the Brewers' new double-play duo, have been taking extra ground balls with first-base coach Garth Iorg to get comfortable.

Last call

Reliever LaTroy Hawkins will start a Triple-A game on Friday and is scheduled for one inning. It would be his first game since last year's shoulder surgery, but Hawkins is on a path to be ready for Opening Day. ... The Brewers' two 2010 Rookie League champions were presented their rings on Thursday. Members of last year's Helena Brewers and Arizona Brewers were honored in a pregame ceremony.