Rossi completes ' very different' Ferrari test.

Valentino Rossi was giving nothing away about his future intentions - or even lap times - after completing his three-day Ferrari test, held at two different circuits.

As previously reported, while many of the MotoGP world champion's rivals were starting a two-day test at Valencia on Wednesday, Yamaha rider Rossi was back behind the wheel of a Ferrari at the team's Fiorano test track - scene of his previous F1 outings.

After reportedly dropping his best lap time in the F2004 racer to around 58secs - approximately two-seconds from Michael Schumacher's Fiorano lap record - The Doctor moved on to the much more challenging Mugello circuit, home of the Italian Motorcycling Grand Prix, on Thursday.

Rossi then concluded his outing with a second day of running at the famous Italian racetrack today, but neither he or the team would give any indication of lap times - although, from the tone of Rossi's comments afterwards, it could be interpreted that he found Mugello much more of a challenge...

"I am happy to have had the chance to get back behind the wheel of a Ferrari Formula 1 car," began Valentino, who is expected to test for Ferrari throughout next season - although not once a month as was initially reported.

"On Wednesday I drove at Fiorano to re-acquaint myself with the car in preparation for these two days at Mugello, which is definitely a tough circuit," admitted the #46, who won this year's Italian Motorcycle Grand Prix.

"Obviously, I already knew the track, even if it is very different sitting in the cockpit from being on a bike. I was able to do around 600 kilometres, increasing my understanding of the handling of the car on a very different track to Fiorano.

"I have to say it was a great experience and I want to thank Ferrari and all the engineers and mechanics who were with me on these fantastic days for once again giving me this opportunity," he concluded.

Rossi will again ride for the Factory Yamaha team in MotoGP next season, although speculation continues to surround the exact team set-up and title sponsor with Rossi apparently refusing to run Gauloises cigarette colours again.

The seven-times world champion has no contractual ties with MotoGP beyond 2006, fuelling rumours of an F1 switch, but he has been quick to rebuff such talk by insisting he could well stay on two-wheels.

Rossi, who dominated this year's MotoGP world championship, is expected to face tougher competition from emerging Honda rivals Marco Melandri and Nicky Hayden next year - both are younger than 26-year-old Rossi, finished second and third in the 2005 world championship and have now become MotoGP race winners.

MotoGP engine rules will change from 990cc to 800cc in 2007.