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The Packers have been without center J.C. Tretter since a Week Seven knee injury, and it doesn’t appear he’s going to be back anytime soon, if at all.

Via Wes Hodkiewicz of the team’s official website, Packers coach Mike McCarthy said Tretter had knee surgery Tuesday, and wouldn’t be available this week.

The fact they’ve kept him on the roster this long remains a bit of a surprise, and the surgery now suggests the possibility of some degree of recent setback.

Corey Linsley has been starting in his place since the initial injury.

Tretter is an unrestricted free agent at the end of the season.