After missing the entire preseason and the first two games of the regular season with a torn meniscus, Duce Staley expects to return to the Steelers backfield this Sunday. "He's looked very good," Bill Cowher said yesterday. "It's the second consecutive week he's taken part in every practice, and we'll see where he is at the end of the week." Staley will serve as a backup to AFC rushing leader Willie Parker.