Gallagher threw 75 pitches in a rehab start with Triple-A Sacramento on Thursday, feeling no lingering effects of the shoulder fatigue that has kept him out of the rotation since Aug. 19.
"I feel good," Gallagher said Saturday. "I felt good going out there and was able to locate my pitches and pitch how I wanted to pitch, and how I know I'm able to."
Gallagher and manager Bob Geren both confirmed that the right-hander would be ready to go Wednesday in the team's series finale with the Tigers and noted that Gallagher would likely be on a pitch count of 85-100 pitches.
Left-hander Dan Meyer will go back to the bullpen to make room for Gallagher in the rotation. Gallagher will be looking for his first victory since joining the A's in the trade that sent Rich Harden and Chad Gaudin to the Cubs in July. Gallagher has gone 0-2 in six starts since his debut victory over the Angels, with a 4-6 record and a 5.23 ERA this season between Chicago and Oakland.
Despite the rainy conditions in Baltimore on Saturday, Gallagher's plan was to play catch, making 30 to 35 throws from 90 feet, to keep himself loose for his Wednesday start.
Amanda Comak is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.