ALAMEDA, Calif. -- While Oakland Raiders starting safety Nate Allen returned to practice Wednesday on a limited basis pass-rusher Khalil Mack and receiver Amari Cooper, did not participate in the workouts.

Mack missed last Wednesday’s practice with the knee injury that kept him out this Wednesday. But on Thursday, he proclaimed himself healthy and then went on to tie the franchise record with five sacks in an upset win at Denver. Mack spoke to the media Wednesday before practice and seemed fine. He likely would have not talked to the media if he was ailing.

Cooper showed up on the injury report last Thursday with a foot issue that kept him out of practice Wednesday. He played Sunday at Denver but did not have a catch for the first time in his rookie season.

Allen missed the Denver game with a knee injury. Barring a setback, Allen should be able to play Sunday. Starting right tackle Austin Howard left the Denver game in the third quarter with a knee injury. He did not practice Wednesday. Monday, Oakland coach Jack Del Rio said Howard was day-to-day and he was replaced by Khalif Barnes.

In other Raiders’ notes: