Hunter is 3-4 with a 6.11 ERA (81.01 IP, 55 ER) in 15 games for the Orioles. He had 13 starts.
Hunter made a relief appearance on Saturday in an 11-5 loss against the Cleveland Indians. He allowed five runs in 1 2/3 innings. He threw 51 pitches.
The Baltimore Sun's Dan Connolly reports, Miguel Gonzalez is expected to be promoted.