"If he's ready at that point, I'm going to be really happy," Roenicke said. "I just don't know if he's going to be ready then. I think we're not really planning on that early."
Greinke has yet to play catch. He has been doing cardiovascular training, elevating his heart rate to the point where he feels the rib injury, Roenicke said.
The Brewers' quest for a starter to fill in for Greinke into the regular season got more complicated Friday in the span of eight hitters.
2010 Spring Training - null
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"It's the same thing, just coming in and, whether it's the big-league setting and he thinks he needs to make a good impression, whatever it is, he's not himself," Roenicke said. "We need to get him to relax and pitch the kind of ballgame we know he can. Hey, at that age, I don't know if I could do that, either."
Peralta's high pitch count in the inning, which included a pair of walks, was the primary reason he was lifted, Roenicke said.
If it's not Peralta who grabs the spot, non-roster invitees Eulogio De La Cruz and Marco Estrada are among the possibilities that have been mentioned, along with Amaury Rivas and Mark Rogers -- both on the 40-man but optioned to Minor League camp earlier this week.