David James admits that he will have no qualms about missing out on the World Cup if he cannot prove his fitness.
James is still considered to be England number one, despite being 39.
But he has struggled with injuries this term and tore a calf muscle last month, at a time when he was also overcoming previous knee and shoulders operations.
And Fabio Capello has made it clear he will not select any players who are not fully fit.
James acknowledges that he needs to be 100 per cent fit to make it onto the plane for South Africa.
"I fully understand where the manager is coming," James said.
"He is a good talented coach - and I'm not saying that to suck up to him. He's the best coach I've worked with.
"England are going to be successful and I want to be involved."
But James admits he will not be booking an appointment with Serbian medics for the new horse-placenta treatment.
"There's more chance of me buying one of Michael Owen's horses than getting rubbed with horse placenta," he quipped.