Derek Carr's hand injury nothing beyond a bruise, MRI shows

Sunday Blitz: Bengals-Raiders recap (3:00)

Jim Basquil and Eric Allen break down the Bengals' 33-13 win over the Raiders. (3:00)

OAKLAND, Calif. -- The battered and woeful Oakland Raiders received good news Monday, when an MRI showed second-year starting quarterback Derek Carr simply has a bruised hand and that it's "nothing serious," head coach Jack Del Rio said.

Del Rio said he does not know if Carr will be ready to play Sunday, when the Raiders host the Baltimore Ravens, but he said the team was "relieved" by the test results.

Carr's availability this week will depend on the extent of swelling in his hand, but Del Rio said the swelling has already started to subside. The Raiders' next practice is Wednesday.

"He was up here in the office this morning showing me he could squeeze a ball," Del Rio said. "It was good news. We're all relieved."

Del Rio said the Raiders currently don't plan to add another quarterback. Matt McGloin, who relieved Carr in the second quarter of the Bengals' 33-13 victory, is Carr's only backup.

Oakland has been in contact with Christian Ponder, whom the team cut earlier this month. Ponder has a workout set with Philadelphia on Tuesday.

Carr injured his hand early in the second quarter when he tried to stiff-arm Cincinnati Bengals cornerback Adam Jones.

Carr fumbled the ball and did not return to the 33-13 loss. He did not speak to the media after the game.

"Using his throwing hand as a straight-arm tool, I would probably not ask him to repeat that," Del Rio said Monday.

Earlier, sources said the Raiders were not expecting Carr to play this week and called Ponder, who was a surprising cut from the team's 53-man roster, considering the team retained just two quarterbacks.

A 2014 second-round pick, Carr was the only rookie quarterback to start every game last season. He completed 7 of 12 passes for 61 yards Sunday.

The Bengals led 10-0 when he left the game.

Meanwhile, the Raiders agreed to re-sign safety Taylor Mays, with several at the position out with injury, a source told ESPN NFL Insider Adam Schefter. Mays, who was with Oakland for two weeks until he was cut in September, had also considered signing with Seattle.

The Raiders fear safety Nate Allen has torn his ACL, and he was to undergo more testing Monday.

Del Rio said there is no firm answer on Allen's injury and that the team hopes Allen, who signed a four-year, $23 million deal this year as a free agent from Philadelphia, could play again this year.

Starting safety Charles Woodson is scheduled for an MRI after injuring his shoulder Sunday. Woodson told his agent he has a dislocated shoulder. There is no timeline for his return.

Woodson, who will turn 39 next month, hasn't missed a game since returning to Oakland as a free agent from Green Bay in 2013.

Also Monday, the Raiders released safety Brandian Ross, who had been on the injured reserve list.

Information from ESPN NFL Insider Adam Schefter and ESPN's Josina Anderson was used in this report.