Mo Farah may be gearing up for his debut at the Virgin Money London Marathon, but one of his fellow London 2012 heroes is determined to overcome illness and land a record seventh title.
Wheechair racer David Weir, who memorably raced to four gold medals two years ago, was on antibiotics as he struggled with a chest infection last week.
But the 34-year-old was able to train through the illness and insisted he was in "very good shape" ahead of tomorrow's race.
Weir is level on six London wins with Tanni Grey-Thompson and said: "It seems like I'm stuck on six at the moment – six Paralympic golds, six World Championship golds and six London Marathons – so it is getting to me a bit and I really want to put every effort in on Sunday."
Weir only managed fifth place last year as he enjoyed a lighter season following his Paralympic exploits, but he has pulled out of the Boston Marathon a week on Monday to concentrate all his efforts on London.
"I've got my hunger back for training now," said Weir. "The next couple of years are busy ahead of (the 2016 Paralympics in) Rio. I'm not retiring yet. Even if I don't win on Sunday, I'll keep going."
The 'Weirwolf', as he became known at London 2012, predicted the race would likely come down to a sprint finish, with Switzerland's Marcel Hug, Canadian Josh Cassidy and South African veteran Ernst Van Dyk expected to be among his main challengers.
In the women's event, defending champion American Tatyana McFadden returns to the road a month after winning Paralympic silver in cross country skiing.