Since his contract was purchased in late June, Peralta has pitched in short and long relief.
"Joel has done a good job," Riggleman said. "He has really thrown a lot of strikes -- a nice repertoire of pitches -- and comes right at hitters. We are going to try to work him in some more situations where we have a lead and are in closer ballgames. He has had lot of good appearances. You get to the point where it's not a small sample of work. It's fairly a large number of appearances with a lot of success."