After missing time earlier this season with nerve issue in his throwing shoulder, Palmer returned to the field and had been a big part of the teams offense and their 8-1 start.
However on Sunday the season appeared to come to an end for Palmer who went down with a knee injury during the fourth quarter against St. Louis.
Carson Palmer signed $119M deal w/ Bengals Dec. 29, 2005; tore ACL 10 days later. Palmer signed $50M deal Fri; AZ fears he tore ACL today.
— Adam Schefter (@AdamSchefter) November 10, 2014
Palmer will undergo an MRI and the Cardinals will provide an update on Monday.