Knox (lower leg) didn't participate in Wednesday's practice, Alaina Getzenberg of ESPN.com reports.
The Bills opened a three-day mandatory minicamp Tuesday, but Knox left the initial practice after colliding with safety Kaiir Elam. The tight end was spotted wearing a sleeve on his left leg Wednesday and appeared to be walking without a limp, so for now, Buffalo seems to be exercising caution with Knox. He'll have one more chance to suit up at minicamp Thursday before his focus shifts to getting back to 100 percent health ahead of training camp at the end of July.