Valentino Rossi admitted he was a 'little bit worried' after finishing seventh fastest on the combined free practice times on day one of the season-ending Valencia MotoGP.

Rossi is favourite to finish as the championship runner-up to Repsol Honda's Marc Marquez, entering the final race weekend of the 2014 season with an advantage of 12 points over his Movistar Yamaha team-mate Jorge Lorenzo.

However, the Italian star has yet to find a satisfactory setting with the front tyre after trying Bridgestone's asymmetric tyre and Rossi will aim to gain a few more places during final practice and qualifying at the Spanish track on Saturday.

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"I think that the front tyre choice will be very important. We have three options and here we have the asymmetric tyre for the second time, which is not so bad. I tried it and also tried the medium, but we still have to decide which one we'll use because we're not all good with the setting," he said.

"We had some problems that at the end of this morning weren't so bad, but this afternoon I struggled a lot more to ride the bike and I didn't feel good. In fact, my rhythm is not fantastic, so we have to try to make things better tomorrow.

"We're a little bit worried, because usually we go with the harder tyre, but on the hard tyre we lose a lot of time, but the soft tyre looks to be a little bit too soft," Rossi added.

"This is the situation at the moment, but we hope that the track will improve so we can use the softer option."

Rossi says that although Yamaha has worked hard to develop its seamless shift gearbox for the M1, more improvements are needed if the team is to close the gap to Honda next year.

"Yamaha has worked very hard on the gearbox to improve the seamless so that we have better shifting and braking, when you shift down," he said.

"But I think this is not enough; we will have to do something else and for sure we will speak after the race and try to understand the way to try to close the gap."

Rossi set his best lap in 1m 31.767s in FP1, which left him 0.471s behind the Honda of Marquez.