"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