Jaime Alguersuari predicts 'chaotic' Brazilian Grand Prix because of the rain

The Spanish driver qualified in 13th position on Saturday and was pleased to be ahead of the Saubers, with which his Toro Rosso team is fighting for seventh place in the championship.

Alguersuari is aware, however, that the points are only awarded on Sunday, and said it will be vital to have a sensible race if it rains.

Toro Rosso is currently just one point behind Sauber ahead of the season finale.

"P13 and P14 on the grid is not so bad for the team," said Alguersuari. "I am pleased to be ahead of Sauber on the grid, but the points are only given out tomorrow, when we can expect a chaotic race because it is meant to rain.

"The key in those conditions will be not to do anything stupid, nor take too many risks, stay calm and then finish the race. The track conditions have changed a lot even from this morning to this session, but if it rains that evolution won't continue and it should be an interesting race."

Team-mate Sebastian Buemi qualified in 14th place, the Swiss unhappy with his position after being unable to post any timed laps in final practice because of a technical problem.

"I am not happy with the result, even if I feel I did the best I could this afternoon," he said. "However, we did not have a good preparation for qualifying, as I was unable to run in the morning.

"Added to the fact I did not drive in FP1, because Jean-Eric was in my car on Friday morning, I've really had very few laps so far this weekend. We must learn from these mistakes to ensure we don't make them again. As for tomorrow's race, anything is possible, because I think our car is quite competitive, so I am hopeful of having a good afternoon."