J.C. Tretter out for “multiple” weeks with knee injury

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The Packers lost a defensive lineman in Friday’s game against the Raiders when defensive tackle B.J. Raji tore his biceps and Sunday brought word that they’ll also be without their starting center for a while.

Coach Mike McCarthy said at his press conference that center J.C. Tretter suffered a “significant” knee injury and will be out for “multiple” weeks as a result. Jason Wilde of ESPNWisconsin.com reports that Tretter is expected to miss five or six weeks.

“Once the ones went out of the game, and once he settled down, that’s when it started bothering him,” McCarthy said. “It was bothering him at halftime, then when I got back in here after the game [the medical staff] ended up putting him on crutches.”

Tretter, a 2013 fourth-round pick, broke his ankle last summer and missed the entire season. Corey Linsley, a fifth-round pick this year, is the next man up at the position. The Packers’s offensive line depth already took a hit this summer when Don Barclay tore his ACL, so things will be stretched even thinner in the early weeks of the season.