Allen went 1-for-4 with a run in a loss to the Reds on Thursday.
Allen had been summoned from Triple-A Las Vegas on Wednesday, but Thursday marked his first taste of big-league game action since May 1. The 25-year-old infielder drew the start at shortstop Thursday, but it remains to be seen how much playing time the typically light-hitting Allen will see down the stretch with the A's expected to give Jacob Wilson a long look.