Coach Mike Tomlin said Tuesday that Rush is in the NFL's five-step concussion protocol, Alan Saunders of SteelersNow.com reports.
Rush will need to gain full medical clearance in order to suit up Sunday on the road against Denver. Tomlin said there is a "level of anticipation" that Rush will be cleared for Week 2, at least. He played exclusively on special teams during Pittsburgh's win over the Falcons in Week 1.