There is no timetable for Drew Pomeranz's recovery from a fractured hand, and according to manager Bob Melvin, no one feels worse about it than the A's left-handed starter.

Pomeranz punched a chair on his way into the clubhouse after allowing seven earned runs in under four innings against the Rangers on Monday, and he'll need to be replaced, for the time being, in the starting rotation.

"It's disappointing," Melvin said. "It affects how we go about our business. Gotta realize there's ramifications when you do something like that, and he's realizing that right now."

With Pomeranz on the 15-day DL, the A's need a starter for Saturday's game against the Red Sox, and the team has not settled on who it will be.

Left-handed pitcher Brad Mills, who was purchased from the Milwaukee Brewers on Tuesday morning, "will be a candidate," according to Melvin.

Melvin acknowledged he doesn't know much about Mills, only that "he's somebody our organization has liked for a while."

Mills last pitched in the majors for the Angels in 2012, following three years with the Blue Jays. The 29-year old is 4-2 with a 1.56 ERA in 14 games, 12 starts with the Triple-A Nashville Sounds this year, collecting 77 strikeouts to 18 walks.