Bachar will serve as the Pirates' opening pitcher in a bullpen game Sunday against the Royals, Colin Beazley of the Pittsburgh Post-Gazette reports.
Lowe went 2-for-4 with a home run, two RBI and an additional run scored in Saturday's 6-5 win over the Royals.
Simon went 1-for-4 with a two-run home run in Saturday's 6-5 win over the Royals.
Drohan struck out two and allowed no hits and one walk over 1.2 scoreless innings of relief in Friday's 6-5 extra-inning victory over the Orioles.
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.
