On Sunday morning, the NFL released the following statement:
Saturday's daily COVID testing returned several positives tests from each of the clubs serviced by the same laboratory in New Jersey. We are working with our testing partner, BioReference, to investigate these results, while the clubs work to confirm or rule out the positive tests. Clubs are taking immediate precautionary measures as outlined in the NFL-NFLPA's health and safety protocols to include contact tracing, isolation of individuals and temporarily adjusting the schedule, where appropriate. The other laboratories used for NFL testing have not had similar results.
Statement from Steelers General Manager Kevin Colbert:
On Saturday, we had six players absent from practice due to our adherence to NFL COVID-19 protocol. None of those players were required to be placed on Reserve/COVID-19 and will be returning to meetings today and practice on Monday.