Moto3 title leader Jack Miller insists he has 'nothing signed' for 2015 and isn't even thinking about next year.

The Australian star has enjoyed instant success since joining the Red Bull KTM Ajo team, winning on his Qatar debut and adding a further two victories from the six rounds.

Miller's form has even led to speculation about a leap to MotoGP next year, while rumours of some form of agreement with the Marc VDS Moto2 team first emerged last September.

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"I don't want to think about what will happen next year; I cannot afford to think about anything else other than this season," Miller declared. "I wish this was something only spoken about after the season ends, although I know that this isn't possible.

"But all that is my manager's job, not mine. I only know that I have nothing decided for next year. I have no contract for the future, so we are completely open and free to negotiate."

Miller added: "People talk a lot in the paddock and this is not good, as they put a lot of rumours out there that are not true.

"I only know that I have nothing signed for next year and that I, personally and as a rider, am focusing solely on this great opportunity that has been given to me by the Red Bull KTM Ajo team, to fight for the Moto3 World Championship."

Miller's title advantage has been reduced to just five points over Romano Fenati heading into this weekend's Catalunya round, following a last lap fall in Mugello.

Another rider being linked with a step up to MotoGP next year is Moto2 title leader Esteve Rabat. Asked about his 2015 plans in the pre-event press conference, the Marc VDS rider replied: "For the moment it is too early [to say]. We must focus on this year because first we need to win in Moto2."