Mo Farah will not defend his 10,000 metres Olympic title after failing to attain the qualifying time at the British Athletics Championships on Friday.
The four-time Olympic champion missed the qualifying time in an invitational 10,000m at the British Athletics Championships in Manchester by 19 seconds.
The six-time world champion needed to go under 27 minutes 28 seconds at Manchester Regional Arena to book his place on the plane to Tokyo ahead of Sunday night's deadline.
But he clocked 27 minutes 47 seconds and will not be able to defend the 10,000m title he won in 2012 and 2016.Farah, who also has six world titles over 5,000 and 10,000, moved away from the track to concentrate on the marathon for more than three years but returned for another shot at the Olympics over his favourite distance.
"I don't know what to think or what's next. If I can't compete with the best, why bother?" said Farah.
"There's no excuse in terms of conditions - it is what it is. I genuinely thought I'd come out here, get the time and then go back to the training camp.
"I've had an amazing career. Thinking about it tonight it's a bit shocking and I don't really know what to say.
"I'm lucky enough to have so many medals. I'm one of these athletes who, if you can't compete with the best, why bother?"