I'm not tied to Williams - Button

BAR boss Nick Fry has warned Jenson Button he must fight his contract battle with Williams on his own, without help from his current team.

Button wants to stay with BAR if he can find a way out of a deal for 2006 which Sir Frank Williams insists is binding.

"It's between Jenson and Williams," said Fry. "The two contract teams need to sort things out.

"We've made it clear we would love to have him here for the long run but we can't really do a lot more than that."

Williams defiant in Button tussle

Sir Frank Williams is determined to force Button to stand by his word and he faces a lengthy fight to extricate himself from a deal he signed last year after failing in a bid to quit BAR.

"Clearly from what's been said he has a contract with Williams," Fry added.

"That's not one we have any knowledge of and clearly we haven't seen it. It's not really within our control particularly."

Depending on how the Button situation is resolved, BAR could replace both their drivers for next season.

Barrichello linked with BAR move

Fry is believed to have already signed a two-year contract with Ferrari driver Rubens Barrichello, who would provide the team with a proven race winner.

He could either replace Button or partner the Englishman in 2006, leaving Japanese driver Takuma Sato out in the cold.

Sato finally scored his first point of the season in Hungary on Sunday after a terrible start to the season.

We need two drivers who can be up there at every race BAR boss Nick Fry

But Fry is adamant BAR need two drivers who can consistently deliver the goods.

"Takuma drove well, ahead of the Renaults who were on the same tyres, which was good for him," added Fry, who expects to confirm at least one of his 2006 drivers "within the next month or so".

"His chance hasn't gone already, far from it. He needs to put in decent performances for the rest of the year but the door is still open.

Button should honour his contract and move to Williams From Murray Have your say on Five Live

"Lots of people have expressed interest in coming to the team which is really very encouraging. They can see the opportunity here just as Jenson can but as far as specifics, I can't say anymore.

"We certainly need two drivers who can score points consistently and one of those at least has to have the potential to be the world champion.

"You don't win the constructors' championship by having one good one and one not so good one, or one that doesn't score points. We need two drivers who can be up there at every race."