Ben Spies insists he won't rush his return to MotoGP competition as he faces another protracted lay-off through injury.

The American, who has started just two races for Pramac Ducati this season because of ongoing injury woes, was in the midst of his comeback event at Indianapolis when a fall during free practice saw him dislocate his left shoulder.

Having already spent months in recuperation from a right shoulder injury, the ailment is a bitter blow for a rider that hasn't competed at full fitness for almost a year now.

Related Articles

Despite this new frustration, Spies won't put a date on a potential return and though he doesn't expect to be sat on the sidelines for as long on this occasion, he says he won't return until he is back at 100 per cent once again.

"I didn't get too much sleep last night, as my shoulder's a little painful since I didn't take much pain medicine yesterday," he said. "Now I'll rest up for the next couple days. I fly back to Dallas on Monday, and on Tuesday I'll see with my doctor if I need surgery or not, and also make sure my wrist is okay.

"I'll try to come back as soon as possible, but I also want to come back at 100%. There's no reason for me to rush back just to fill the grid, but definitely this injury is nothing like the right shoulder; the pain is very bad right now, but the healing process won't be anything near as long as the other one -- I know that for sure.

"We just need to do the right things, follow the doctors' orders again, and rehab. This injury won't even affect me in a few months, but I need to do the right things the right way."

Spies also spoke more about what caused the highside accident, shortly after he had left the pits during Saturday morning practice.

"It was a lot more my fault than anything. The way a lot of the [traction control] systems work, when you're in first gear, the systems don't work. Usually when you come out of the pits, you hit second gear, but this track is unique, and you stay in first gear until you're out of Turn 4.

"If I had been riding the bike through the season, it would have been something in my head that I would have known or maybe taken more cautiously. It was definitely more my fault than anything else. The speed I was going was a speed that this should not have happened. It doesn't matter how it happened; the result is what it is.

"I feel sorry for the fans and everybody who has been behind me and Ducati, in general. I think we were doing a good job, but I was not happy to be in 12th place, to be less than one second off the pace. We hadn't changed the bike at all, and we had two hours on the bike. We were close, and we were going to be able to fight.

"It wasn't a crash or a mistake that I was over the edge or pushing too hard. It was just a silly mistake. Like we saw Jorge [Lorenzo] do at Laguna [in 2011, when his Traction Control was not engaged], it wasn't riding over the limit, and it cost me a pretty good injury."

Spies will be replaced by Michele Pirro for the next round at Brno in less than a weeks' time. The Ducati test rider has been Pramac Ducati's regular stand-in this year having started six races with the team.