NEW YORK (WFAN) — Michael Pineda has been placed on the 15-day disabled list with a right flexor forearm muscle strain.

#Yankees place RHP Michael Pineda (right flexor forearm muscle strain) on 15-day DL. @CC_Sabathia will make tonight’s start. — New York Yankees (@Yankees) July 30, 2015

According to CBSSports.com/WFAN baseball insider Jon Heyman, the Yankees’ starting pitcher has a Grade 1 strain and could miss up to a month.

word is pineda has a grade 1 forearm strain, about like miller had. up to month. nova seems to be ok.#yankees — Jon Heyman (@JonHeymanCBS) July 30, 2015

Manager Joe Girardi told WFAN’s Joe Benigno and Evan Roberts that CC Sabathia would take Pineda’s turn in the rotation on Thursday night against the Rangers. However, as for who will occupy Pineda’s spot for the duration of his time sidelined, Girardi said no decision has been made.

WFAN host Mike Francesa first reported that Pineda is injured and would not pitch on Thursday.

“I hear Pineda’s hurt,” Francesa told WFAN co-hosts Joe Benigno and Evan Roberts just after 1 p.m. on Thursday. “He’s not pitching tonight, and he might be badly hurt. And I hear (starting pitcher Ivan) Nova’s hurting.”