A's rookie Jharel Cotton was a late scratch from Monday's start in Detroit after suffering a strained right groin.
Cotton began his typical pregame throwing routine at Comerica Park. Then cameras caught him grabbing at his leg. Shortly after, he walked off the field and long reliever Raul Alcantara went out to warm up. Alcantara made the start in the opener of a three-game series against the Tigers.
Though there was no indication from the A's about the severity of the strain, with less than two weeks left in the regular season, it brings up the possibility of Cotton simply being shut down for the season. More detail likely will be given to reporters by manager Bob Melvin after the game.
Cotton is 8-10 with a 5.81 ERA in 23 starts this season.