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NASHVILLE, Tenn. (AP) _ The Tennessee Titans likely will be without leading receiver Derrick Mason and starting cornerback Samari Rolle for at least 3-to-4 weeks because of injuries.

Mason separated his left shoulder and Rolle strained his right hamstring during Tennessee's 52-25 loss at Oakland on Sunday.

Rolle, a fifth-year player who was an All-Pro in 2000, was scheduled for an MRI Monday to determine the extent of his injury. He was hurt in the first quarter helping tackle Jerry Rice. Coach Jeff Fisher said Rolle had a great deal of swelling but should not need surgery.

Mason, a sixth-year veteran who had 73 catches and 1,128 yards last season, was injured late in the game. Fisher said he will need a brace to stabilize the shoulder because the joint keeps moving.

``It's reasonable to assume we'll have a chance to get Derrick back after the bye week,'' Fisher said, which comes Oct. 20.

The Titans likely will use rookie Mike Echols or veteran Dainon Sidney to replace Rolle. Echols hurt his knee and had to leave the Raiders game late, but Fisher said he should be able to practice. Sidney has been deactivated each game this season.

The Titans play Washington this Sunday in Nashville.