Arizona Cardinals quarterback Drew Stanton may be out for the season following arthroscopic surgery to fight an infection, according to NFL.com.
Stanton was hoping to make a return for the playoffs after suffering an MCL sprain earlier this month in a win over the Rams.
The infection was discovered Wednesday and is believed to be from an outside medical treatment.
Rookie Logan Thomas was originally slated to start Sunday's game against the 49ers, but the Arizona Republic reported Thursday the Cards have decided instead to stick with Ryan Lindley for a second straight start.
Cardinals coach Bruce Arians might be trying to get Lindley ready for the playoffs.
Arizona has had QB problems this season. Starter Carson Palmer was lost for the season with a knee injury. Then, Stanton suffered his aforementioned knee injury.
The Cardinals are 11-4 and have already clinched a playoff berth.