Ferrari have extended Felipe Massa's contract to the end of the 2010 season.
Massa will be seeking his sixth career win in Brazil
The announcement would seem to end claims that there is a place in the team for Fernando Alonso if he leaves McLaren at the end of the season.
Massa joined Ferrari at the end of 2005 from Sauber after initially being signed by the Italian team in 2001.
The 26-year-old has won three races this year and is fourth in the championship, which ends at his home Grand Prix at Interlagos on Sunday.
Massa was handed the Ferrari race drive as team-mate to Michael Schumacher at the start of 2006, since when he has won five times in 34 races.
He finished third in the drivers' championship last year ahead of the likes of Giancarlo Fisichella and his current Ferrari team-mate Kimi Raikkonen.
Alonso's relationships with McLaren boss Ron Dennis and team-mate Lewis Hamilton have deteriorated this season.
Earlier this month, the Spaniard complained that his team were not giving him "the treatment a two-time champion deserves".
Things had reached rock bottom following the 'Spygate' case which saw McLaren fined £49.2m and stripped of their constructors' points for 2007.
F1's governing body the FIA decided McLaren personnel, including Alonso and test driver Pedro de la Rosa, had used Ferrari data which should not have been in their hands.
It was widely reported that Alonso had warned Dennis he would go to the FIA with fresh evidence if he did not receive top-driver status at the team.
Dennis has already said he would not stand in Alonso's way if he wanted to leave the team.