Clearly smarting from comments Fernando Alonso made to the media recently, MotoGP sensation, Valentino Rossi, has laid down the ultimate challenge to the F1 World Champion, a series of head-to-heads on various racing machinery.

Previously, as the media speculated on the possibility of Rossi joining Ferrari in 2007, Alonso told a press conference that he didn't believe the Italian had the potential to win F1 races, far less a World Championship.

"He might finish fifth or even get on the podium," he mocked, "but some time I could do the same on the bikes if I was given enough time to practise."

Like a red rag to a Spanish bull, Rossi has hit back, challenging the Renault driver to a series of races.

"I read that if Alonso is able to make some practice then he can put a MotoGP bike on the podium with me," the Italian told Motorcycle News. "Well, I think we should drive a Formula One car, a World Rally car and a MotoGP bike, add the times together and then we will see who is the fastest."

Over to you Fernando!