JACKSONVILLE – The fit is right, and figures to remain that way.

That's how the Jaguars see their relationship with Paul Posluszny, which made Thursday's move an easy one.

Posluszny, the Jaguars' starting middle linebacker who will enter his ninth NFL season next season, on Thursday agreed on a contract extension with the team, extending the six-year contract he originally signed in July of 2011. He will turn 31 this month.

"We are excited to get an extension done with Paul," Jaguars General Manager David Caldwell said.  "Paul is a true pro in every sense of the word. He is a valuable asset on and off the field and has done a great job mentoring our younger players while also performing well on the field.

"He has worked extremely hard rehabbing after his injury last year and will be ready to go for our offseason conditioning program beginning next week."

Posluszny (6-feet-2, 242 pounds), who signed with the Jaguars as an unrestricted free agent from the Buffalo Bills shortly before the 2011 season, has led the team in tackles in three of his four seasons. He made the Pro Bowl as an alternate following the 2013 season, then played seven games last season before sustaining a season-ending pectoral muscle injury.

"I can't say enough about Paul and what he means to our team," Jaguars Head Coach Gus Bradley said.  "He is highly respected by his teammates and our coaching staff. You don't measure a guy like Paul with just his stats but the overall impact he has on our team. 

"He has earned the respect of everybody in the building with his preparation, determination and drive to get better each and every day."

Posluszny, a second-round selection by Buffalo in the 2007 NFL Draft, registered 192 tackles and two sacks in 2011, a franchise-record 231 tackles and two sacks in 2012 and 161 tackles and three sacks in his 2013 Pro Bowl season.

He had 69 tackles and two sacks last season before his pectoral injury late in a victory over Cleveland on October 19.

Before last season, Posluszny had missed just one game in three seasons with the Jaguars.

Bradley praised Posluszny at the NFL Annual Meeting in Phoenix, Arizona, last month, saying Posluszny has three aspects the team seeks in a player: humility, intelligence and warrior's mentality and spirit.

"Out of all those three traits we have a guy like that with Poz, who has that humility and intelligence and that warrior spirit," Bradley said. "It's hard to find those three traits."