49ers' Mykel Williams: Possibly hurts ACL

Head coach Kyle Shanahan said Mykel Williams might have injured his ACL in Sunday's win over the Giants, Vic Tafur of The Athletic reports.

Williams will undergo further testing Monday to confirm whether he suffered an ACL injury. If the 21-year-old is forced to miss extended time, Sam Okuayinonu would likely start at defensive end in his place.