Gallen allowed one run on three hits and two walks over four innings during Tuesday's 7-5 loss to the A's. He had eight strikeouts and didn't factor in the decision.
The 25-year-old pitched well after missing the start of the season due to a hairline fracture in his right forearm, with the only run he gave up coming via a solo homer off the bat of Stephen Piscotty. Gallen threw 82 pitches Tuesday and should continue building up his workload when he starts again next week at Cincinnati.