Knox (foot/hamstring) remained sidelined during Thursday's practice, Alaina Getzenberg of ESPN.com reports.
Following back-to-back absences at practice, what Knox is able to do during Friday's session will be telling with regard to his chances of being available Sunday against the Steelers. If he ends up missing the contest, Quintin Morris and Tommy Sweeney would be next in line to handle snaps at tight end for Buffalo in Week 5.