Now that Brandon McCarthy is sidelined with a shoulder injury, left-hander Tyler Skaggs will get a chance to fill his spot in Arizona’s rotation.

According to Steve Gilbert of MLB.com, Diamondbacks manager Kirk Gibson confirmed this evening that Skaggs will be called up from Triple-A Reno to start tomorrow against the Cardinals. McCarthy was scheduled to undergo an MRI today to determine whether he has a stress fracture in his shoulder, so it’s unclear how long Skaggs will be asked to fill in.

Skaggs was very impressive in a spot start during a doubleheader last Monday against the Rangers, striking out a career-high nine over six scoreless innings. Ranked as the No. 12 prospect in the game by Baseball America this spring, the 21-year-old southpaw owns a 5.23 ERA and 54/17 K/BB ratio in 51 2/3 innings over nine starts this season in Triple A.