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Gradkowski replaced Russell midway through last season and won two of his first three starts, beating Cincinnati and Pittsburgh. He was hurt late in the first half of his fourth start and missed the rest of the season with knee injuries.

Gradkowski has shown the ability to avoid sacks and to get the ball to the wide receivers in his short time in Oakland. He completed five passes each to starting receivers Louis Murphy and Darrius Heyward-Bey for 138 yards and a touchdown. The duo had just seven catches for 72 yards in three halves with Campbell.

Despite not having as strong an arm as Campbell, Gradkowski was better able to get the ball down field. He completed four of eight passes that went more than 10 yards downfield, for 79 yards, according to STATS LLC. Campbell was just 3 for 14 for 69 yards on those throws.

NOTES: DT Richard Seymour, who missed last week’s game with a hamstring injury, said he will be ready to play this week. … RB Michael Bush (broken left thumb) did everything at practice and could return this week. … OL Robert Gallery is still sidelined by his hamstring injury that forced him to sit out last week. … The Raiders re-signed OL Eric Pears to fill the roster spot of S Stevie Brown, who was released Tuesday but could come back on the practice squad.