The Twins announced during Wednesday night’s game against the Oakland A’s Pablo Lopez will be out eight to 12 weeks with a strain in his throwing shoulder.

Minnesota Twins right-hander Pablo López is expected to be sidelined 8 to 12 weeks because of a strained shoulder. The Twins said Wednesday that López has a Grade 2 strain of the teres major muscle.

It’s a tough blow for the Twins’ rotation, which has been among baseball’s best this season. López has been a big reason why, with a 2.82 earned-run average across his 11 starts. To fill his place in the rotation, the Twins called up David Festa, who started on Thursday and gave up eight runs in 3⅔ innings against the Athletics.