Valentino Rossi believes the new GP15 will allow Ducati to fight with Honda and Yamaha in MotoGP this season.

Gigi Dall'Igna's heavily revised Desmosedici is being hailed as finally solving the understeer issues that blighted the likes of Rossi during his two seasons at the Italian team.

Adding to Rossi's concerns is that Ducati, having not won a race since 2010, has access to a softer grade of rear tyre - a major advantage in qualifying.

Related Articles

"I am quite worried about the Ducati, because already the old bike was not so bad," the Yamaha star told reporters at Sepang on Tuesday evening.

"In one lap they have the advantage of the softer tyre, but already with the old bike they are very fast. Iannone last time here did a '59.3.

"This bike looks better and all the riders are very happy so if they make another step they can stay in front. So I think Ducati can fight with Honda and Yamaha.

"In practice I think it will be difficult to stay in front [of them] because with the super soft tyre they have a big advantage.

"In the race we hope we can take some advantage because last year Honda and Yamaha were better than Ducati, especially in the second part of the race."

Rossi - runner-up to Marc Marquez last season - was sixth fastest on day two of the second Sepang MotoGP test, when Iannone and Dovizioso were third and fourth.