Titans head coach Brian Callahan said after Sunday’s 34-10 loss to the Bills that Levis (shoulder) is week-to-week, Nick Suss of the Nashville Tennessean reports. Levis wasn’t ruled out for Week 7 until one day prior to Tennessee’s matchup against Buffalo, when continued testing of his right AC joint sprain seemingly took a turn for the worst. The shoulder injury was initially sustained by Levis in Week 4, and he got a bye to rest then suited up Week 6 versus Indianapolis. Callahan said of Levis’ worsening sprain that “he ended up feeling it toward the end of the [Colts] game on a couple of those throws,” and that for Week 7 “his mechanics were not where they needed to be and his arm strength felt weakened.” If Levis’ health doesn’t notably improve as the Titans’ road matchup against Detroit in Week 8 draws nearer, Mason Rudolph will be in line to draw another start.