Ashcraft (arm) played catch Friday but is not expected to return this season, Kevin Gorman of TribLive.com reports.
Mitchell (neck) will start in center field and bat seventh in Friday's game against the Orioles.
The Brewers recalled Gordon from Triple-A Nashville on Friday.
Mangum is not in the lineup for Friday's game against the Royals.
Flores is not in the lineup for Friday's game versus the Royals.
Montgomery earned the save Thursday in a 7-4 win over the Brewers, allowing two walks while striking out two over 1.1 scoreless innings.
Harrison (10-5) took the loss Thursday against the Pirates, allowing five runs (four earned) on four hits and two walks over 1.2 innings. He struck out two.
Lara will start in center field and bat second in Thursday's game against the Pirates.
Yelich is out of the lineup for Thursday's game against the Pirates.
Mangum is out of the lineup for Thursday's game against the Brewers.
