Mo Farah collapsed and was taken away in a wheelchair after finishing second in the New York City half marathon on Sunday.
The double Olympic champion fell awkwardly around the six-mile mark but carried on and finished behind winner Geoffrey Mutai of Kenya in 61mins 8secs.
Farah, 30, was strong enough to pass and hold off third-placed Stephen Sambu from Kenya in a sprint finish, but then fell to the ground minutes after crossing the line and required medical attention.
Farah said: "I feel good. I just tried so hard in the race. It's not a big deal.
"When I fell, I fell pretty hard. I told myself "don't rush" but when I saw the gap, the gap was big.
"Conditions here today were very cold. London won't be as cold as this.
"It would have been nice to win today, but he (Mutai) is a good athlete. Nothing changes for London - I will just keep training."
It is understood he may have temporarily lost consciousness in the freezing conditions before being helped into a wheelchair.
The 13.1-mile race was Farah's first competitive outing since the Great North Run last September, but comes just four weeks before the Briton makes his much-anticipated full debut in the London Marathon on April 13.
Farah was not taken to hospital and is understood to be 'fine'.
His team attributed Farah's discomfort to the stark change in temperature after spending two months training at high altitude in Iten, Kenya.
Farah is due to return to Kenya on Tuesday for two more weeks of training under the tutelage of his coach, Alberto Salazar, before coming back to Britain ahead of his marathon debut.
- Daily Mail