Andrea Iannone is set for a tough MotoGP weekend at Aragon after re-dislocating his left shoulder in training.

Just when the worst of his shoulder problems looked to be behind him, after an original dislocation during testing at Mugello in May, the Ducati star repeated the injury while on a training run near his home at Vasto last Wednesday.

Following an MRI scan the morning after, Iannone immediately began electro-medical tecar therapy in order to get ready for the Spanish race, but won't be 100% fit.

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"Unfortunately last week I tripped over while I was out training: in the fall, I put my arms out to protect myself, but a sudden movement caused my shoulder to pop out again," Iannone confirmed.

"I have been undergoing a couple of hours of tecar treatment a day, but it will be a tough weekend for me, because the track has many direction changes, ups and downs and a lot of hard braking. I clearly won't be 100% on form, but at least I'll be there."

Iannone - who will require surgery at the end of the season - is currently fourth in the world championship, 24 points ahead of Tech 3's Bradley Smith and 31 clear of Ducati team-mate Andrea Dovizioso.

Dovizioso, eighth last time at Misano, has raced in every edition of the Arag?n GP, his best result being a third place in 2012.

"For sure we want to make up for the Misano race: Arag?n is a track where last year I was going well before I crashed when it began to rain," said Dovizioso. "It's a very unusual circuit and is interesting for us with the GP15, because it will give us an idea of how competitive we are. I expect a lot from this weekend."