Carr was injured in the second quarter of Oakland's game against Cincinnati, a game in which Cincinnati won 33-13.
The potential still exists that Carr could play on Sunday, depending on the amount of swelling in his thumb.
Carr goes in for an MRI today, but the team isn't expecting him to be under center for the Raiders week 2 matchup against the Ravens. Matt McGloin took over for Carr after the injury and is the expected starter for the Raiders. He completed 23-31 for 142 yards, with two touchdowns and one interception and a fumble on Sunday.
The Raiders have also apparently contacted Christian Ponder, who was one of the casualties of the 53 man cut at the beginning of the month. However, the level of Ponder's interest is unknown.
The Raiders are also facing injury concerns at other positions. Safety Nate Allen, a popular off-season acquisition for the Raiders, is believed to have a torn ACL. In addition, safety Charles Woodson is scheduled to have an MRI on his shoulder after injuring it late in Sunday's game.
If Woodson and Allen are both out of Sunday's game, the Raiders will be very thin at the safety position.