Williams, the Saints' 2015 third-round draft pick out of Florida State, suffered a neck injury on a first-quarter tackle of Giants tight end Larry Donnell with 6:15 left in the quarter. Williams' head made contact with Donnell's right knee. Then teammate Craig Robertson's leg hit Williams' head, causing his neck to whiplash a second time.
Williams was placed on a backboard and his neck stabilized as he was carted off the field with this helmet on for further evaluation.
Williams will follow the NFL's concussion protocol this week. His injury leaves the Saints with three healthy cornerbacks -- Sterling Moore, Ken Crawley and De'Vante Harris.