Desmond Bishop has always felt slighted and snubbed. He's taken those frustrations out on foes across the National Football League.

Next season, those feelings could be at a fever pitch. And that's terrific news for the Green Bay Packers.

"I have a lot of pent-up anger," said Bishop, an inside linebacker.

Bishop spent the first three years of his career waiting and watching. When he finally got the chance to play, Bishop delivered in a big way.

First, Bishop moved into the starting lineup in 2010 for an injured Nick Barnett, then arguably upgraded the position and helped Green Bay win Super Bowl XLV. In 2011, Bishop led the Packers in tackles, posted five sacks and was a Pro Bowl alternate.

But on just the eighth defensive play of Green Bay's preseason opener in San Diego on Aug. 9, Bishop suffered a torn hamstring that ended his season.

Bishop was a bit ornery early in his career when he rode the bench behind A.J. Hawk and Barnett, but losing a year to injury made him even more irritable.

"For sure," Bishop said. "This time, you know it's 100% certain that you're not going to play. That's the worst."

Bishop is one of Green Bay's most physical defensive players. If there's someone opposing offensive players try avoiding across the middle of the field, it's Bishop.

With Bishop sidelined, Green Bay's lack of physicality was even more evident. Both D.J. Smith and later Brad Jones filled in adequately for Bishop, but neither player packs the pop of Bishop.

"Desmond just brings a toughness that you love to have on defense," Packer defensive end Ryan Pickett said. "We had guys step up that played really well. But Desmond's a tough guy to replace. There's no doubt about that."