"We've reached an agreement with (Renault) team chief Flavio Briatore on all major issues," said Ralf's manager.
The Indian finished\nsecond in private testing for the Williams Formula One team at the Jerez circuit in Madrid.
The Renault team boss has not ruled out leaving Formula One when his contract runs out this season.\n
Formula One carmakers are prepared to set up their own championship without Ferrari if need be, said Renault team president Patrick Faure.
Pedro de la Rosa has accused Renault of using illegal 'team orders' to help Fernando Alonso take second place at the Turkish Grand Prix.
The Italian driver was warned by his new F1 boss that the next two years with Renault will decide his career.
Valtteri Bottas seized his first pole position of the Formula One season in Austria on Saturday with Mercedes team mate and world championship leader Lewis Hamilton having to settle for second.
Ferrari's Sebastian Vettel put himself on pole position to retake the Formula One lead from Lewis Hamilton after setting the fastest lap in qualifying for the Singapore Grand Prix.
The timing of the news immediately triggered speculation that Frenchman Eric Boullier could be heading to McLaren, who were due to launch their 2014 car later in the day in an online presentation.