The Panthers reiterated Monday that Jake Delhomme was the team's starting quarterback despite his atrocious performance on Sunday afternoon.
Delhomme threw four interceptions and lost a fumble that was recovered for a touchdown in the Panthers' 38-10 loss to the Philadelphia Eagles.
McCown was hurt while playing for Delhomme, who was pulled in the third quarter.
His official injury is a sprained left knee and foot, but he was in a boot on Monday and was walking with the assistance of a crutch.
He was placed on IR later in the day.
The signing of A.J. Feeley gives the Panthers their best option at backup quarterback in recent memory.
The signing of David Carr before the 2007 season was supposed to provide the team with a solid option to challenge Delhomme, but he ended up being a major bust when he was thrust into action following Delhomme's season ending Tommy John surgery.
Matt Moore and Josh McCown were heading into their second season as the Panthers' backup quarterback tandem, a duo that has been criticized for not pushing Delhomme to get better.
Despite reports from Panthers training camp that Delhomme had improved his footwork and accuracy, nothing of the sort showed up on Sunday.
Feeley's last regular season action was in 2007. He played in three games and threw for 681 yards and five touchdowns to go along with eight interceptions. In his career, he's thrown for 4,070 yards, 27 touchdowns and 29 interceptions in 23 games.
It is likely that Feeley will be the number two quarterback, and Moore will remain the team's third and emergency quarterback.