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The Packers’ defensive line has suffered a setback.

Nose tackle B.J. Raji suffered a torn bicep in Friday’s exhibition vs. Oakland, Tom Silverstein of the Milwaukee Journal Sentinel reported. The injury is thought to be potentially “season-ending,” Silverstein reported Saturday.

The Packers’ first-round pick in 2009, the 28-year-old Raji has been a starter along the Green Bay defensive line the last five seasons. Veteran Letroy Guion and rookie Mike Pennel are listed as the top backups at nose tackle.

Earlier Saturday, Ian Rapoport of NFL Media reported it was suspected Raji had suffered a biceps tear. And now, it appears those concerns were well-placed. The focus now turns to the severity of Raji’s injury. If there’s a chance he could again play this season, placing him on injured reserve with a designation to return would be a possibility.