The Indian driver says he would like to take the place of Williams test driver Alex Wurz's, who has been promoted as one of the team's two race drivers.
Kimi Raikkonen, the only man standing between 24-year-old Alonso and the title, made an error in qualifying for the Brazilian Grand Prix. and starts on the third row in fifth place.
McLaren set the pace in Friday's Brazilian Grand Prix practice with Colombian Juan Pablo Montoya the fastest race driver.
The German seized his second successive pole position as Williams swept champions Ferrari off the front row.
World champion Michael Schumacher qualified fifth fastest for Sunday's Monaco Formula One Grand Prix.
Kimi Raikkonen went further, saying he had no intention of leaving McLaren.
India's Narain Karthikeyan will start 19th on the grid on Sunday's Turkish Grand Prix.
Fernando Alonso feels Sunday's inaugural Turkish Grand Prix could play to Renault's strengths.
The McLaren driver suggested that whoever he signed for, it would be something of a gamble.
Kimi Raikkonen will start Sunday's British Grand Prix from pole position after a flying qualifying lap that showed McLaren were back in business.
Formula One world champion Lewis Hamilton saw off a strong Ferrari challenge at the Italian team's home Grand Prix to seal his seventh pole position in a row and 11th in 12 races on Saturday.
The Spaniard will replace the Colombian at McLaren for the rest of the season.
The International Automobile Federation (FIA) said in a statement that it was reviewing Sunday's race result after a timing discrepancy came to light.
The Finn, second in the Formula One championship to Renault's Fernando Alonso, suffered a blown engine in Friday's first free practice.
Ferrari's Michael Schumacher and Rubens Barrichello finished second and third respectively.
Germany's Nick Heidfeld was second for Williams with Australian team mate Mark Webber third for his first podium finish.
Renault's championship leader Fernando Alonso was pushed off the front row for his home Spanish Grand Prix.
Narain Karthikeyan finished 17th in the first qualifying round at the San Marino Grand Prix
Rediff's Formula One fanatics in a chat after the Melbourne Grand Prix.
The Indian ace's Jordan-Toyota E15 developed electrical problems and he was forced to retire in the Bahrain Grand Prix.