Michele Pirro struggled to make strong headway in free practice at the Argentina MotoGP on Friday as the Ducati rider concluded FP2 in 18th position.

Pirro, who is standing in for the injured Cal Crutchlow, was unable to find a good feeling with the British rider's Desmosedici GP14 but is determined to make solid progress on Saturday.

"It was a bit of a difficult session, but we managed to get some good indications for tomorrow. Today I didn't use the soft tyre because I needed to improve my feeling with the bike," said Pirro.

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"I am confident because the GP14 is going well: I'm just missing a bit of rhythm but tomorrow I'm sure I can move up the time sheets.

"Cal's bike has a slightly different set-up to the one I normally use in the tests: the track however is new for everyone and it's me who has to adapt to the bike," he added.

"Tomorrow in any case I count on being closer to the other Ducatis."

He set a fastest lap of 1m 42.898s to finish last of the Ducati riders behind team-mate Andrea Dovizioso in fifth and Pramac riders Andrea Iannone (10th) and Yonny Hernandez (12th).