Safety Nate Allen back at practice with Raiders

ALAMEDA, Calif. (AP) Oakland Raiders safety Nate Allen practiced Wednesday for the first time since suffering a serious knee injury in the season opener.

Allen tore the MCL in his right knee during a Week 1 loss to Cincinnati. He was placed on injured reserve with a designation to return then spent the next six weeks working his way back.

While Allen - who signed with Oakland in the offseason after spending his first years with the Eagles- is cleared to practice, he won't be eligible to play until the Raiders face the Vikings on Nov. 15.

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Oakland has three weeks to decide whether to add Allen to the 53-man roster or keep him on injured reserve.

The Raiders own the worst-ranked pass defense in the NFL while giving up more than 303 yards a game through the air.