The possibility of holding the 2027 London Marathon over two days, Saturday and Sunday, is still being explored.
Brasher previously said the idea would be to hold the elite women’s race on one of the days, along with other women who have made it in through their previous marathon times and wheelchair races.
The men’s equivalents would take place the other day, with mass races taking place on both days.
Speaking to BBC Breakfast on Tuesday, Brasher said he hoped it would be confirmed by the end of May.
“This is only for one year. We are interacting, and have been interacting for a long time, with many stakeholders,” he said.
“They rightly want us to go through a process to ensure that what we do is appropriate. People will be disturbed – it’s never happened before on a Saturday.”
“There are a lot of plans and mitigations that we have and we would have done some unique things.
“But I think this shows the desire and need in the country. “More than £400 million in economic and social benefits would be realized as a result of the two days, and we believe more than £150 million would be raised for charities.
“It would be something unique. We hope to get there, but we’re not there yet. I’m sure it’s the right thing to do.”