By limited video (blocked by goalpost & other players), #KyleWilliams @buffalobills with likely significant right knee MCL injury (hope ACL spared). At risk to miss start of season as estimate 4-6 weeks minimum for return. https://t.co/3oP2QUfVtl

— David J. Chao - ProFootballDoc (@ProFootballDoc) August 18, 2018