Green Bay Packers coach Mike McCarthy confirmed defensive lineman Muhammad Wilkerson required surgery – necessitating an overnight hospital stay in the Washington area – for a “significant” injury suffered during Sunday’s loss to the Redskins.

Wilkerson was carted off the field with an air cast on his ankle and then taken to a local hospital in an ambulance after suffering the injury during the second quarter Sunday.

“Muhammad Wilkerson actually stayed in D.C. last night, the Washington area. There was a procedure he needed before he could travel,” McCarthy said. “I would say it’s significant.”

McCarthy declined to provide any more details.

Ian Rapoport of NFL Network reports the injury is likely season-ending.

#Packers coach Mike McCarthy said DL Mo Wilkerson had surgery last night in the Washington area for a “significant” injury. I can add it’s likely season-ending. Bad blow for a key addition to their D. — Ian Rapoport (@RapSheet) September 24, 2018

The injury occurred when Packers safety Kentrell Brice leg-whipped the back of Wilkerson’s legs during a play in the second quarter.

The Packers signed Wilkerson, a former Pro Bowler for the New York Jets, to a one-year deal this offseason. He has five tackles in three games.

Wilkerson, 28, will be an unrestricted free agent after the season.