Most likely scenario, as @ESPNStatsInfo proposed, is this, per sources:
• Move Steelers-Ravens from Week 7 to Wk 8 (Steelers & Ravens on bye in Wk 8)
• Move Steelers-Titans from Week 4 to Wk 7 (Titans bye is Wk 7).

This is contingent upon no more positive tests in Minnesota.

— Adam Schefter (@AdamSchefter) October 1, 2020