NFL Media Insider Ian Rapoport first reported Friday, per two sources informed of the situation, the team discovered an infection Wednesday which required arthroscopic surgery. The infection was believed to have been caused by outside medical treatment, Rapoport added.
The development could be why Cardinals coach Bruce Ariansdecided to go back to Ryan Lindley for Sunday's game against the 49ers. Logan Thomas was originally slated to start in order to get him some preparation as a backup. Now, Lindley will need all the reps he can get. Stanton was originally viewed as a heavy favorite to start the team's opening-round playoff game.
Though it's hard to bet against Arians, Stanton was likely the team's best hope of advancing in the playoffs and winning their first postseason game since 2009.
"I have no idea about infections and all that," Arians said. "You can talk to the doctors about that stuff. He's on schedule for next week."
In two starts this season, Lindley has been less than serviceable, with a completion percentage barely eclipsing 40 and no touchdowns. Pushing him to a playoff win might be Arians' best coaching job ever, though.