Stoner revealed that 'nothing seems to have worked' in terms of treatment and regaining fitness in time for next weekend's US GP is now his number one priority.

"I've been feeling fine all week but started to feel run down again on Friday and I've just got worse as the weekend has gone on,” said Stoner. “I've taken every kind of supplement and vitamin tablet you can think of but nothing seems to have worked, so it is obviously something we need to have looked at closer because I can't keep going like this and it is costing us points.

“Thankfully I had a fantastic bike underneath me again today and I owe the team for that. A big thank also to Dott. Macchiagodena and our physiotherapist Freddie [Dente], who took good care of me both in Catalunya and here. Unfortunately we don't have much time to get fit for Laguna but we'll see what we can do,” he added.

Stoner, who began the Dutch TT equal on points with Rossi and Lorenzo, is now nine points from the world championship lead.