Ferrari boss Luca di Montezemolo has admitted that Fernando Alonso will struggle to win the world championship title this season.

The Spaniard is currently 13 points behind Red Bull's Sebastian Vettel with just one more race left this season.

"I know it will be very tough, but I and all of us believe we can do it," said Di Montezemolo.

"Now we go to Sao Paolo with the will to win, knowing we will fight for it right to the last kilometre of the last lap of the race."

The final race of the season will be in Brazil this weekend.