New Orleans Saints cornerback P.J. Williams was placed on injured reserve today, as first reported by Mike Garafolo of NFL.com.

Williams suffered a concussion in the first quarter of Sunday's loss to the New York Giants after teammate Craig Robertson inadvertently banged his knee in the back of Williams helmet when the two made a tackle.

Williams lay motionless on the field for a period of time before medical personnel carted him to the locker room while players for both teams took a knee in prayer.

Reports from Williams agent earlier this week indicated he would eventually be fine.

However, placing Williams on IR means he is likely done for the season, though a return later this season isn't out of the question.

Beginning this season, NFL teams are allowed to bring one player off IR back to the 53 man roster. The team must designate which player six weeks into the season.

It's been widely believed New Orleans first round rookie Sheldon Rankins will be that player. He was placed on IR before the start of the season due to a broken fibula.

Williams joins fellow starting cornerback Delvin Breaux (broken fibula, not on IR) and nickle back Damian Swann (head, is on IR) on the list of Saints injured defensive backs.

Veteran cornerback Keenan Lewis was expected to start heading into training camp this year, but was cut during training camp.