ORCHARD PARK, N.Y. -- Chris Kelsay no longer has to worry about whether or not he'll fit in the Buffalo Bills' new defensive scheme after signing a four-year contract extension worth about $24 million.
Kelsay revealed before practice Wednesday that he had signed the extension one day earlier and now is locked up through the 2014 season.
"I'm thrilled," Kelsay said. "I wanted to end my career here, and this gives me an opportunity to do that. Obviously, it still comes down to production and putting it out on the field."
Buffalo's second-round pick out of Nebraska in the 2003 draft, Kelsay is tied with two others as the second longest-serving member on the current roster behind punter Brian Moorman, a 10-year veteran. Kelsay is a defensive captain and has proven durable over his career, during which he has missed just two games because of injury.
Kelsay was entering the final season of his existing four-year deal, which is scheduled to pay him a $3.7 million base salary.
There were questions about how Kelsay would make the switch from defensive end to outside linebacker as the Bills introduced a 3-4 defensive scheme this offseason under first-year coach Chan Gailey.
"I think they kind of wanted to do their homework to see how I fit into this system before anything was done," Kelsay said, noting the team approached his agent about an extension about three weeks ago. "Obviously, they thought highly enough about me to offer me the deal. And I feel very honored that they did so."
The extension also was regarded as vote of confidence for Kelsay, as it came from a new regime that's headed by first-year general manager Buddy Nix.
Kelsay is a seven-year starter who has 22 sacks, three interceptions and five forced fumbles in 113 career games. His best season came in 2006 when he was credited with 61 tackles and posted career-highs with 5.5 sacks, 14 quarterback pressures and 16 quarterback hits.
In other news Wednesday, starting defensive end Marcus Stroud missed practice because of a sore ankle he hurt during a 38-30 loss at New England last weekend. Without providing any details of the injury, Gailey said there's a possibility Stroud might not play against the Jets.
On the bright side, starting middle linebacker Paul Posluszny returned to practice and declared himself likely to play Sunday after missing the past two games with a sprained right knee.
"I think there's a great chance of going," Posluszny said. "I'm really excited about how my knee felt."
The Bills' defense has struggled without Posluszny, having allowed a combined 62 points and 801 yards in its past two games, including a 34-7 loss at Green Bay on Sept. 19.
Linebacker Kawika Mitchell spoke to reporters for the first time since being placed on the season-ending injured reserve list because of a foot injury on Sept. 10.
Wearing a protective boot, Mitchell said he severely sprained his left foot when a teammate stepped on it during practice. Mitchell didn't require surgery, but he said doctors projected it could take up to 12 weeks to heal.
It was a disappointing end to Mitchell's season after the eight-year NFL veteran missed the final 11 games of last season with a right knee injury.
"It's extremely frustrating," Mitchell said. "After going my whole career and whole life, basically, not being injured, and then having to face this two years in a row, it's a little unreal. But in actuality, it's reality, so I'm just dealing with it."
Notes: LB Andra Davis (shoulder) and TE Jonathan Stupar (foot) both missed practice. ... Rookie RB C.J. Spiller was named AFC special teams player of the week after scoring on a 95-yard kickoff return against New England. ... Jets coach Rex Ryan confirmed to Buffalo reporters on a telephone conference call that the team placed a claim on QB Trent Edwards after the former starter was released by the Bills on Monday. Edwards was awarded to the Jacksonville Jaguars (1-2) because they have a worse record.