Holdout running back Chris Johnson and the Tennessee Titans agreed to a four-year extension on Thursday, the team confirmed.

"He'll sign tomorrow and take his physical and be ready to start practicing," Titans general manager Mike Reinfeldt said Thursday night before Tennessee played New Orleans in a final preseason game. "It was a tough negotiation, but both sides gave some and we got it done."

A league source told ESPN NFL Insider Adam Schefter that the extension is worth $53 million with $30 million guaranteed. The extension will be tacked on to the two years he had remaining on his previous contract, putting him under the Titans' control through the 2016 season.

Johnson will receive $31 million over the first three years of the extension. Carolina Panthers running back DeAngelo Williams, who signed a five-year, $43 million contract earlier this offseason, will get $30 million over the first three seasons of his deal.

Johnson was en route to Tennessee Friday to sign the deal, and Mike Munchak expects the star running back to be busy learning the changes to the Titans' offense.

Munchak, the new head coach, said Johnson likely will be spending some extra time with running backs coach Jim Skipper over the next few days. Johnson also has lots of new people to introduce himself to with offensive coordinator Chris Palmer and quarterback Matt Hasselbeck.

Munchak said Friday that Johnson has plenty of time to get ready for the opener at Jacksonville on Sept. 11.

Talks between the sides intensified on Wednesday night with both recognizing that if Johnson was going to play in Tennessee's regular-season opener against the Jacksonville Jaguars, the deal had to get done in the next few days.

With Munchak, having Johnson on the team for the entire season was crucial for Tennessee coming off a 6-10 season.

"We have nine days," Reinfeldt said. "The main thing is for

him to get comfortable with the system."

Tennessee wanted Johnson to at least have a few days of practice with Hasselbeck in a revised offense with Palmer. The only other Titans running back with any NFL carries is Javon Ringer with 59 in his career, and he has been hurt most of the preseason. Rookie Jamie Harper from Clemson started the past two preseason games for Tennessee.