Sir Mo Farah is set to turn his attentions back to running on the track as he hopes to defend his Olympic 10,000m title.
Farah, the four-time Olympic champion, had switched from the track to marathon running in 2017, winning the Chicago Marathon the following year.
However he is now planning to return to the track in a bid to defend the 10,000m title he won in both London and Rio.
Farah said on social media: “Next year, I'm going to be back on the track and I'm going to give it a go in the 10,000m.
“Hopefully I haven't lost my speed but I will train hard for it and see what I can do. I'm really excited.”
Farah would have to qualify for Tokyo next year and admitted he had learned a lot from his time running marathons.
He added: “It's been really exciting competing in the marathon over the last couple of years.
“To win the Chicago Marathon was nice and to finish third in the London Marathon was OK, and it's been a great learning curve for me.”