Tom Daley has travelled to the Fina World Championships in Barcelona despite having a glandular problem that has put his participation in doubt.
Daley, 19, the 2009 world champion, flew out on Tuesday.
The Olympic bronze medallist will compete in the 10m individual platform event on 27 and 28 July if fit enough.
"His glands have swollen and that means he is not able to get into the various shapes because of the pain factor," coach Andy Banks told BBC Devon.
"He's just coming out of that now, and the physios are getting him out of that, hopefully in time for the competition in a couple of weeks' time.
"He's done progressive lead-ups on lower boards while he's had some of these problems. It's not as if he has done nothing, but it's about preparation.
"But he's still chomping at the bit, and I'm sure he'll give as good a performance as he can."
Daley previously missed the European Championships and much of the World Cup after suffering a tricep injury during training in April.
He returned from an eight-month break at the World Series event in Edinburgh in that month, where he showed little signs of rust as he secured gold.
Prior to that, he admitted he had struggled with motivation after the Olympics.
The World Championships, which run from 19 July-4 August, feature diving, high diving, swimming, synchronised swimming, open water swimming and water polo. The diving events take place between 20-28 July.