Ferrari's Fernando Alonso warned his Formula One rivals on Monday that he was in better shape than ever.

The Spaniard, a double world champion with Renault, told reporters at a media event for sponsors Santander at Barcelona's Circuit de Catalunya that the season starting in Australia next week could be his best yet.

"Last year was the best year of my career and I was very happy with the performance, but I think this year will be better," said Alonso.