The Baltimore Ravens have released David Olson and signed Josh Woodrum.

Woodrum will serve as the Ravens' No. 3 quarterback behind Ryan Mallett and Dustin Vaughan until Joe Flacco returns from a back injury.

On Sunday, Ravens owner Steve Bisciotti said the team was still considering Colin Kaepernick and asked for fans to "pray for us."

Kaepernick remains a free agent.

Xavier Rhodes has agreed upon a six-year, $78.126 million extension with the Minnesota Vikings.

The deal is one of the richest in NFL history for a cornerback.

The new contract includes $41 million guaranteed and pays more than $42 million over the first three years.

The Tennessee Titans have agreed upon a four-year, $60.4 million extension with defensive tackle Jurrell Casey.

Casey will receive $40 million in guaranteed money.

"I want to make sure I make every play I possibly can," Casey said after signing his extension.

Casey has notched at least five sacks in each of the past four seasons. He made the Pro Bowl the past two seasons.

The Baltimore Ravens have signed David Olson following the injury to Joe Flacco.

Baltimore used offensive assistant coach Matt Weiss to line up under center and hand off to running backs in drills.

Olson will help spell Ryan Mallett, who has taken Flacco's spot with the first-team offense, and Dustin Vaughan, who is on his fourth team in four seasons.

The Ravens also have interest in Colin Kaepernick.

The agreement with Olson would not preclude the Ravens from adding Kaepernick.

Olson most recently played in the Champions Indoor Football league.

The Jacksonville Jaguars have agreed to a five-year contract extension with Brandon Linder worth $51.7 million. Linder's deal will include $24 million in guaranteed money.

The extension makes Linder the highest-paid center in NFL history.

"It means the world to me," Linder said in a statement. "I'd love to play here my whole career. I fell in love with this city and we have big things coming, changing the culture, and now we start tomorrow for training camp. I couldn't think of a better place to play my career."

Linder was the No. 5 center for Pro Football Focus last season. Linder moved from guard to center in 2016.

The Dallas Cowboys have agreed upon a two-year, $15.4 million extension with La'el Collins.

The extension will run through 2019.

Collins would have been a restricted free agent after this season.

Collins' average of $7.7 million is second highest in the NFL amongst right tackles.

The New York Jets have agreed to terms on a four-year, fully-guaranteed $22.3 million deal with sixth overall pick Jamal Adams.

Adams will also receive a $14.3 million signing bonus.

Only four first-round picks from this year's NFL Draft remain unsigned.

The Dallas Cowboys have agreed to re-sign veteran linebacker Justin Durant.

Durant played in 13 games last season for the Cowboys after he was signed just before the start of training camp.

The Cowboys are in need of depth at the position.

The Carolina Panthers have agreed upon a four-year, $45 million extension with Trai Turner.

Turner will receive $20.5 million in guaranteed money and the deal also includes a $15 million signing bonus.

Turner was in talks with the team throughout the summer.

Turner was a third round pick in 2014 and is a two-time Pro Bowler.

The Arizona Cardinals have agreed to sign Chris Johnson to a one-year deal.

Johnson was placed on injured reserve last season after suffering a groin injury in Week 4 that required surgery. He wasn't chosen by coach Bruce Arians to return late in the season, and he finished with 95 rushing yards and one touchdown on 25 carries.

Johnson will be David Johnson's backup.