The Brewers recalled Ashby from Triple-A Nashville on Sunday.
The lefty fills the need for a fresh bullpen arm in Sunday's series finale against Washington. Ashby has rebounded from his disastrous debut to hold opponents scoreless in his last six innings of work, striking out five and walking none in that two-game span. He may be used in a long-relief role if Adrian Houser doesn't last long in his first start since Aug. 3.