Medical personnel check Leonard Hankerson out after he is hurt against the Eagles on Sunday. (Jonathan Newton/The Washington Post)

Washington Redskins wide receiver Leonard Hankerson had damage to his anterior cruciate ligament as well as his lateral collateral ligament repaired when he underwent knee surgery Thursday, according to Redskins Coach Mike Shanahan.

The ACL damage in Hankerson’s left knee previously had not been disclosed. Hankerson now faces a recovery period of seven to nine months, Shanahan said. That is longer than the recovery Hankerson would have faced if he would have suffered only LCL damage.

“They thought there was a possibility [of ACL damage] but they weren’t sure,” Shanahan said.

Hankerson’s surgery was performed in Gulf Breeze, Fla., by orthopedist James Andrews, according to the Redskins.

Hankerson was injured during the Redskins’ loss Sunday at Philadelphia. He has been placed on the season-ending injured reserve list.

Tight end Jordan Reed did not participate in Thursday’s practice, Shanahan said. Reed suffered a concussion during the Philadelphia game. Defensive end Stephen Bowen did not practice because of a knee injury.

Cornerback Josh Wilson (toe), safety Jose Gumbs (ankle) and fullback Darrel Young (hamstring) participated in the practice on a limited basis.