Movistar Yamaha's Jorge Lorenzo dropped from third place in FP1 to seventh in the afternoon at Aragon and admitted he was 'worried' by his time at the Spanish track.

Lorenzo's best lap of 1m 48.969s was 0.684s behind the Ducati of Andrea Dovizioso and although the Spaniard feels strong, he is seeking an improvement from the YZR-M1 on Saturday.

Yet to win a MotoGP race this season, Lorenzo had a better feel with the soft tyre option but is unsure whether or not the compound will last a full race distance.

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"We are using a completely different tyre to the rest of the riders. Valentino didn't like so much the hard front, I don't know if he tried the soft in the last laps but for me it was better with the softer option," said Lorenzo.

"Tomorrow we will do some more laps to see if it will be constant for the duration of the race. We didn't start in the best way possible, we are very far from the front, but the thing that worries us is that we are far from my ideal time here from last year so we have margin to improve.

"I feel great physically and mentally but the bike needs to improve a bit," he added. "We are going to test a different set up for tomorrow so I'm looking forward to continuing."