Boris Johnson said: "Londoners have to be a little bit patient; they have to recognise that this thing (the Olympic Stadium) was not built to be the kind of omni-purpose, world class stadium capable of hosting premiership football that it should be and there's a very clear choice for us all.
"Do we want to rush ahead with a reopening or do we want to go on with the adaptations that will deliver a world class facility?"
More top news
Police in Southwark are appealing to the public for help in finding a teenage girl missing from Bermondsey.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.
The boyfriend of reality TV star Ferne McCann has been arrested on suspicion of attempted murder following an alleged nightclub acid attack.