Jorge Lorenzo declared he is close to full strength as he led Yamaha's charge against Honda on the first day of free practice for the Indianapolis MotoGP.

The Spaniard's aspirations of retaining his MotoGP title have been hampered by collarbone injuries at Assen and then the Sachsenring. And while the summer break proved a welcome chance to get back into shape, Lorenzo concedes he is not quite back to peak fitness.

Despite this, Lorenzo insists his collarbone is feeling good after a day of action around the 'Brickyard', when the double world champion notched up the fourth fastest lap - just two tenths from pace setter and series leader Marc Marquez.

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"The collarbone is feeling good, it's not 100 per cent yet but it's close," Lorenzo said. "It doesn't give me too many problems to ride at a high level. Compared to last year I think we are going to have less problems to fight for the podium. I won here in 2009 but usually it's not so easy for me. Sometimes the other Yamaha riders are faster than me but so far it's a good start."

However Lorenzo confessed that he may lose further points to Honda riders Marquez and Dani Pedrosa, first and second on Friday, without set-up improvements on Saturday. Lorenzo is currently third in the championship, 26 points behind Marquez and ten points behind the other factory Honda of Pedrosa.

"At this track, probably we could lose some points [to the Hondas] but in racing you never know, and we are going to try to not lose points. The race is going to be very long. Let's see what happens if the other riders drop the pace. Then maybe we can have some options.

"But maybe I'm speaking too quickly because tomorrow we have two more practices and can be faster or slower. The main issue is the with the rear tyre, in some corners there is so much spinning.

"We also didn't make so many laps in the afternoon; I wanted to make more but firstly the red flag cost us time and then at the end I found so many CRT bikes there it was hard to get clear laps."