Williams injured his leg/knee during Wednesday's minicamp, and was seen walking with crutches on Thursday, Mike Reiss of ESPNBoston.com reports.
Williams is set to receive a second opinion on his injured leg, but initial indications are pessimistic which could mean the tight end misses some amount of time. Prior to the injury, Williams was projected to fill in as the No. 3 option at tight end behind Rob Gronkowski and Martellus Bennett, but the possible seriousness of Williams' issue could open the door for Clay Harbor to secure that spot with little offseason competition.