By Spike Eskin

PHILADELPHIA (CBS) – NFL free agency began at 4pm on Tuesday, and the Eagles have signed two players, both Eagles who were already under contract. Yesterday, the team extended offensive lineman Todd Herremans, today, they extended defensive end Trent Cole.

Cole signed a four-year extension that runs through the 2017 season.

“We are excited to be able to sign Trent to a new contract,” said Eagles head coach Andy Reid via press release. “Trent plays the game with a level of tenacity that’s hard to replicate. He’s one of the premier defensive ends in the league. We have always said that when you watch the tape of him, it’s hard to tell the difference between his first play and his last play. He has an unbelievable motor that does not stop. And as good as he is rushing the passer, he is equally as good against the run. His energy is contagious on the field.”

Cole, 29 years-old, has spent his entire seven year career with the Eagles since being drafted in the fifth round of the NFL draft in 2005 out of the University of Cincinnati.

Cole has been selected for the NFL Pro Bowl twice, and ranks third all-time on the Eagles sack list, trailing only Reggie White and Clyde Simmons.

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