Source: Sebastian Janikowski, Raiders at impasse over contract

— -- The Oakland Raiders and place-kicker Sebastian Janikowski, who has played more games (268) for the team than any player in franchise history, are in a contractual standoff that could dictate whether the two sides spend this season together.

Oakland has asked Janikowski, 39, to rework his contract, which calls for him to make $4 million in the final season of his deal, according to a source familiar with the situation. Janikowski so far has declined.

The issue could be resolved as soon as Tuesday, with Janikowski accepting a reworked deal or with Oakland moving on to a new kicker.

If Janikowski is still on roster at 4 p.m. ET Tuesday, he will be guaranteed $238,000 -- 1/17th of his salary. Should the Poland product remain on the roster as of 4 p.m. ET Saturday, his deal will become guaranteed for the season.

Complicating matters is the fact that Janikowski has missed the past two preseason games with a back injury, and the team is uncertain whether he will be able to kick in Sunday's regular-season opener against the Tennessee Titans.

With Janikowski's salary high and his back uncertain, it has put both sides in a difficult position as they stare at the prospect of some money becoming guaranteed Tuesday and the rest becoming guaranteed Saturday.

Mike Nugent, Josh Lambo and Marshall Koehn all worked out for the Raiders on Monday, a source told ESPN's Field Yates. All three kickers lost position battles over the weekend.

Janikowski and New England Patriots quarterback Tom Brady are tied for the NFL's longest tenure with their current teams, having both entered the league in 2000.

Janikowski has played 268 NFL games, tied with Lou Groza and Junior Seau for 23rd in NFL history.