Oakland recalled Medina from Triple-A Las Vegas on Tuesday.
Medina will be brought up to make a start against the Angels on Wednesday. The right-hander forged a 3.86 ERA with an 11:8 K:BB and 1.39 WHIP over his 9.1 innings with Las Vegas in three appearances. Medina has shown the potential to miss bats in the minors, but he'll be a risky streaming option in his MLB debut.