Mo Farah

Two years ago, Farah walked away from track events to concentrate on marathons and he finished eighth across 26.2 miles in Chicago last month having won the event in 2018.

However, the 36-year-old has decided to return to shorter distances and will aim to add to his Olympic medal collection at the next Games.

Farah, who will still need to qualify for the event in Tokyo, won gold over 5,000m and 10,000m at the 2012 and 2016 Olympics.

Salazar was banned from coaching during the World Athletics Championships in Doha, after he – along with Dr Jeffrey Brown – were found guilty of possessing and trafficking banned substances after a four-year investigation by the US Anti-Doping Agency.

The verdict resulted in Salazar's Nike Oregon Project being shut down, though the 61-year-old stated he will appeal his four-year ban.

Kipchoge, who skipped last year's race to attempt a sub-two-hour marathon in Italy, could not break Dennis Kimmetto's world record as high temperatures made running conditions difficult in the English capital.

Women's favourite Mary Keitany attempted to break Paula Radcliffe's mixed race record -- assisted by male pacemakers -- but the Kenyan struggled late on in the race, eventually finishing fifth and unable to add to her three London titles.

That allowed Cheruiyot in to take her first London crown, having won her first career marathon in Frankfurt only in October.

Farah will switch his focus to the roads and bowed out in triumphant fashion by edging out Paul Chelimo and Muktar Edris, the Ethiopian who denied him a triple-double at the IAAF World Championships this month, in a time of 13 minutes and 6.05 seconds.

The 34-year-old established himself as one of the all-time greatest long-distance runners by completing the 5000m and 10,000m double-double at Rio 2016, becoming just the second man to achieve the feat.

The 34-year-old, who became just the second man to complete the long-distance double-double at Rio 2016, will switch his attention to the roads after next week's meet in Zurich and signed off in his last race on home soil by winning in seven minutes and 38.64 seconds.

Farah, who won 10,000m gold and 5000m silver at the IAAF World Championships in London this month, sat in the middle of the field before making his trademark push with 600m remaining, taking the lead for his own on the final lap.

British Olympic gold medallists Mo Farah, Helen Glover and Justin Rose were the latest people to have medical files made public by hacker group, the Fancy Bears, on Monday.

Cram said: "We are just normal people and normal people suffer hayfever and asthma that require long- and short-term medication – does that mean you cannot do sport?

"I think we are getting into a crazy scenario where we are assuming everyone is cheating. They aren't. We are frightening people away from top-level sport."

(Picture: watchfit.com)