Knox (hamstring) is on track to play in Friday's preseason game against Detroit, Joe Buscaglia of The Athletic reports.
The Bills want to see how the rookie tight end responds to Wednesday's practice before they make a decision on his status. Knox resumed working out last week and returned to practice Monday. He's competing for snaps against Lee Smith, Jason Croom (hamstring) and fellow rookie Tommy Sweeney, while Tyler Kroft (foot) is in danger of remaining on the PUP list to begin the regular season.