Graziano Rossi, one of his son's biggest fans, admitted that the 27-year-old star was bitterly disappointed after falling on lap five of the Valencia Grand Prix and thus handing the title to American rival Nicky Hayden.

But he said the rider, who has won seven world titles already, would benefit from his defeat.

"I know my son and his character. Valentino will want to prove himself now. Next year he'll be more motivated than ever."

"A defeat could also enrich him from a human point of view," he added.

Italian newspapers gave his unexpected defeat front-page treatment, printing pictures Rossi falling from his bike. They also paid tribute to his stature as a sportsman, noting that he had staged a thrilling comeback since the summer, when he had been 51 points behind Hayden.

Valentino - He Lost Like a Champion, headlined Gazzetta dello Sport, and Corriere della Sera, Italy's best-selling daily, wrote Valentino - The Fatal Error.

There were also tributes from Italian politicians, who saw the rider as an example for the country's youth.

"Dear Valentino, true champions show their colors in moments of difficulty," said Italian Prime Minister Romano Prodi, "Italy appreciates what you have done and the excitement you have provided this season, as you have in the past".

Rossi also received encouragement from Ferrari star Michael Schumacher, who has just retired from Formula 1 racing at the age of 37.

"I'm crossing my fingers for you. You have many years ahead of you to win more," the German said.