Even in the midst of a championship battle, Jenson Button is reportedly also embroiled in complicated dealings about his future at the Brawn team.

The Daily Mail and Sun newspapers in Britain report that, after having agreed to a multi-million pay cut before the start of the season, the 29-year-old driver now wants his money back before signing for 2010.

The Sun quoted a source as saying that Brawn's first counter-offer in monetary terms was "derisory".

Those reports coincide with an article in Britain's Telegraph that says Nico Rosberg has "agreed a deal" to move from Williams to Brawn next year.

The report said both Button and Barrichello are candidates to exit the team to make room for the 24-year-old German, who is strongly favoured by Mercedes-Benz, and that the German carmaker "has never shown much interest in signing Button".

The reports also claim that Button and his management have complained to Brawn about a lack of cooperation from Barrichello's side of the garage, as the outcome of the 2009 title comes down to a straight fight between the teammates.

After Monza, team boss Ross Brawn made a point about ensuring the 2009 showdown would be an "open" fight between his drivers, while Button and Barrichello also referred to the forthcoming free exchange of information when speaking with reporters after the Italian GP.

David Coulthard wrote in a newspaper column: "You would have to be mad to think they (the drivers) would not hold a little bit (of information) back; a snatched conversation with an engineer here, a strategy to eke an extra couple of tenths there.

"That is the way it should be and Ross knows that," the F1 veteran added.


Button in complex talks over future with Brawn