(CLEVELAND) – Cleveland Indians ace Shane Bieber, the reigning AL Cy Young winner, has a strained right shoulder and will not pitch for at least two weeks. Manager Terry Francona said Bieber complained of tightness in his shoulder after pitching Sunday and underwent an MRI. The tests showed the muscle strain, and Bieber will be temporarily shut down. The Indians placed the right-hander on the injured list and recalled reliever Kyle Nelson from Triple-A Columbus. Bieber's loss is a major blow to Cleveland, which has managed to stay in contention in the first 2½ months of the season despite a rash of key injuries. The Indians will now have to survive without Bieber, one of baseball's best pitchers, for at least a few weeks. Bieber allowed a season-high 10 hits and five runs while losing to the Seattle Mariners on Sunday. Bieber is 7-4 this season in 14 starts covering 90⅔ innings. He has 130 strikeouts, has allowed just 33 walks and has maintained momentum from last season, when he led the majors in wins (eight), ERA (1.63) and strikeouts (122).