Farah claimed double gold at the Olympic Games winning the 10,000m and the 5,000 in the space of a week.
He became only the seventh man in Olympic history to do this double and the first British athlete.
And while Farah may now be considered the greatest long-distance runner that this country has ever produced Gebrselassie believes he needs to take it one step further.
Speaking to The Sun Gebrselassie said: "When we talk about long distance greats, he needs to run a marathon or a half marathon.
"Without him doing that you can not talk about him in that way. It’s not easy to just run a marathon.
"I switched to the marathon in 2002 and after my first one I decided to come back. The marathon is not an easy distance.
"He could run a marathon, but if he moved to the marathon too quickly he will finish very soon. He has to be careful.
"He has to wait until he’s finished the 10k and 5k. Then he can do the half marathon and then move up again."
It was heartache for Farah four years ago as he failed to make the final of the 5,000m bit since then he has made major changes in his life in a bid to achieve Olympic glory.
And Farah has suggested that he might look at making the transition to the marathon at some point down the line.
FemaleFirst Helen Earnshaw