Farah said the sub-zero temperatures in New York may also have contributed to his collapse .
Farah has spent the last two months at high altitude in Kenya and is due to return there on Tuesday for his final pre-London tune - up .
Farah , who has spent the last two months at high altitude in Kenya and is due to return there on Tuesday for his final pre-London tune - up , said the sub-zero temperatures in New York may also have contributed to his collapse .