The Kenyan broke the world mark at the Berlin Marathon last year.
One exercise physiologist thinks its imminent and will happen sooner rather than later.
The pair will compete at the Mattoni Olomouc Half Marathon on June 21.
Mo Farah placed eighth in his full marathon debut but vowed to run another one.
The current marathon world-record holder and Olympic Marathon bronze medalist discusses the possibility and likelihood of a sub-2 hour
The annual race through the British capital will be Farah's first time racing the 26.2-mile distance
It was a great 2013 for the marathon.
World records will eventually stop falling, right?
It might happen, but it won't happen anytime soon.