Saying he was thrilled to be sticking around Green Bay for the long-term, Packers linebacker Clay Matthews tweeted a picture of himself signing a new contract extension.

According to a source, the five-year deal pays Matthews $66 million in new money, making him the highest-paid linebacker in the NFL. It is a five-year extension beyond 2013, which means he will be under contract through 2018.

Matthews Tweeted: "Trivial amongst the recent tragic news, but happy to continue my career in Green Bay!"

The Packers later announced the signing.

“Clay has been a productive member of our team and we are pleased to be able to come to an agreement that will extend his Packers career,” GM Ted Thompson said.

Said coach Mike McCarthy: “Congratulations to Clay, who has quickly developed into a core member of our team. His accomplishments and the example he sets on and off the field will be vital to our continued success. We look forward to the rest of his Packers career.”

The Packers said that Matthews would be available for comment at the team's facility at 4:30 p.m.

Matthews was due to make $3.73 million in the final year of his contract, but he was expected to see a bump to somewhere around $13 million per year, which would put him in the same neighborhood as the NFL's highest-paid linebacker, Dallas' DeMarcus Ware.

The franchise tag for linebackers this year was $9.619 million.

A four-time Pro Bowl selection, Matthews was due a huge increase, especially with just one year left on his contract. The Packers were not going to let him get any closer to free agency than this off-season for fear he might take his chances on the free market next year.

It was apparent as early as the scouting combine in February that the Packers and Matthews were close on the average salary per year, but it took time for them to finish the details. At the same time, Matthews' agents, Athletes First, has been also negotiating QB Aaron Rodgers' extension, which is supposed to make him the highest-paid player in the NFL.