According to the AP, Huston Street has a muscle strain in the right side of his chest that sidelined him for Thursday’s game against the Tigers and may keep him out of action at least through Friday. Street felt tightness beneath the armpit area of his right arm during Tuesday’s game against the Tigers, the last time he took the mound. While the injury is considered minor it is unclear whether he will be ready to pitch in the weekend series against the Angels. "The doctors are confident a couple days rest and he's going to be fine," manager Ken Macha said. Street has a 7.94 ERA and four saves in seven appearances this season.
That doesn't sound quite as bad. Just let him rest and please don't go to the DL.