NEW YORK -- The New York Yankees officially put Luis Severino on the disabled list Saturday, but they didn't immediately answer the question of who replaces him in the rotation.

The other question they can't answer is how Severino went from promising future ace to a pitcher who has the highest ERA (7.46) of any full-time American League starter.

"I've felt good all year," Severino said, insisting that the right triceps strain that sent him to the DL was not a long-term issue.

Yankees manager Joe Girardi said he doesn't believe the injury was the cause of Severino's struggles this season.

"He's throwing strikes, but he's not locating the strikes," Girardi said. "For me, that's what we have to get ironed out."

Severino said he felt something in his arm in the second inning of Friday night's start against the Chicago White Sox. Trainer Steve Donohue accompanied Girardi to the mound an inning later, removing Severino after he had allowed seven runs in 2⅔ innings.

Girardi said Severino won't throw for the next five to seven days, but the manager wouldn't disclose the Yankees' plans for him beyond that. He also wouldn't say who will pitch on Wednesday in Arizona, in what would have been Severino's next start.

"We'll worry about Wednesday on Wednesday," Girardi said. "We've got to get to Wednesday."

To get there, the Yankees called up two more pitchers from Triple-A Scranton/Wilkes-Barre: right-handers Chad Green and Conor Mullee. Green would seem to be an option to start on Wednesday, but the Yankees might need him out of the bullpen before that.

To make room on the roster for the second pitcher, the Yankees sent catcher Gary Sanchez back to Scranton. Sanchez was just recalled Friday, and Girardi conceded that the original plan was for him to be the designated hitter Saturday. But after Severino's early exit, the need for an extra arm was too great.

The Yankees played with just 12 position players Saturday -- one fewer than normal -- and with center fielder Jacoby Ellsbury still unable to start because of a hip injury. Ellsbury hasn't played since May 6, but Girardi said there's a chance he could return to the lineup Sunday.

The Yankees also made a minor league trade Saturday, acquiring right-hander J.R. Graham from the Minnesota Twins for a player to be named later or cash. Graham, who was optioned to Double-A Trenton, has a 5.10 ERA in 40 major league appearances for the Twins.