Williams tore his left ACL during Wednesday's practice and he'll likely be placed on Injured Reserve, Jim McBride of the Boston Globe reports.
As expected, Williams' injury was a serious one as he was seen on crutches Thursday awaiting the unfortunate results. This ensures Clay Harbor's spot as the No. 3 option at tight end behind Rob Gronkowski and Martellus Bennett heading into the 2016 season, as Williams enters a long road to recovery.