Drew Stanton will almost certainly be out for the rest of the season.
The Arizona Cardinals discovered an infection Wednesday which required arthroscopic surgery. The infection was believed to have been caused by an outside medical procedure, Ian Rapoport reported Friday.
Stanton has been out since suffering an MCL sprain earlier in the season.
With Carson Palmer out for the season, Stanton had become the Cardinals' starting quarterback.
Ryan Lindley will likely start for the Cardinals in the playoffs.