Williams have rejected claims that Juan Pablo Montoya could quit the team to join McLaren at the end of this season.
Montoya is staying at Williams - at least for 2004
Colombian Montoya is widely believed to have agreed to join McLaren in 2005.
But there are rumours that the move could happen a year earlier.
Williams technical director Patrick Head said: "We have a contract with Juan until the end of the 2004 season, and there are no circumstances in which that will not be fulfilled."
The rumours have suggested Montoya would move a year earlier, as part of a complicated swap deal that could see either Mark Webber of Jaguar or BAR's Jacques Villeneuve moving to Williams.
In this scenario, if the Webber move came off, McLaren driver David Coulthard would switch to Jaguar to replace Webber.
The theory is based on the belief that Williams and Montoya would be in a difficult situation throughout 2004 if all parties knew before the season started that he was moving to McLaren the following season.
Webber also rejected the speculation.
"I don't know where it's come from. I think they're just firing up the
managers, keeping an eye on their salaries," the Australian said.
Webber is contracted to Jaguar for the next two seasons, but Renault have an option to take him if they choose.
Webber is managed by Renault F1 team boss Flavio Briatore.
Coulthard has been announced as a McLaren driver for 2004.
Montoya is second in the championship, three points behind Ferrari's Michael Schumacher, with one race left after Indianapolis.