Four-time Olympic champion Mo Farah will defend his 10,000m title at the 2020 Tokyo Olympics.
Great Britain’s Farah, 36, quit track events in 2017 to concentrate on the marathon.
But having won gold in the 5,000m and 10,000m at the 2012 and 2016 Olympics, he has decided to return to where he has been most successful.
Farah, who is also a six-time world champion and has yet to run the marathon at a major championship, hinted earlier in the year that he could make the switch because he “missed” the frequency that track racing provided.
He finished eighth in the Chicago Marathon in October, having won it in 2018 in only his third race.