Miller was not expected to play in Week One and has already been ruled out, however, it’s appearing more and more likely he’ll be ready to play in Week Two.
Per CBS Sports:
Miller has impressed the Steelers with his recovery as well, being activated from the PUP list only recently, and a return for Week 2 is likely in his case. Miller was a vital cog in coordinator Todd Haley’s offense a year ago, the team is thin at tight end and faces a critical game against the Bengals in the second week.
Miller has long been the security blanket of the Steelers’ offense and getting him back just a week into the season would be an unexpected, though, extremely positive development.
It could also coincide with the return of running back Le’Veon Bell who could also see action in Week Two.