So Nelson would probably fit somewhere during the season's final road trip against the Braves, who have the NL East locked up, or against the Mets, who are not in the postseason picture.
Since a callup on Sept. 3, Nelson has made a pair of appearances out of the Brewers' bullpen. He pitched two perfect innings at Wrigley Field on Sept. 6 in his Major League debut, then struck out two batters in another perfect inning against the Reds on Saturday at Miller Park.
"He's an aggressive guy, and that makes a difference," Roenicke said. "Maybe he'll be wild, I don't know. But he's going to come at you and he's going to give you his best stuff. Those are the kind of guys you want to see, so if we can get him in there, we want to see him."
Nelson, 24, was 10-10 with a 3.25 ERA in 27 starts between Double-A Huntsville and Triple-A Nashville this season. He was Milwaukee's second-round Draft pick in 2010.
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. Kevin Massoth is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.