Ethiopia's Bekele, the 5000m and 10,000m world record-holder, got the better of Farah when the pair raced in the Great North Run half marathon in September.
Farah, the current world and Olympic champion over 5000 and 10,000 has already confirmed he will run in London after completing half the distance last year.
"Of course, if I train hard I will do a fast time," Bekele, 31, said on the IAAF website (www.iaaf.org).
"But I can't say I will run 2:03, 2:05 or 2:06. I cannot say. The only thing is I have to prepare myself and train hard until I finish a marathon."
(Reporting by Toby Davis; editing by Justin Palmer)
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