West Ham United have today been named as the top choice to move into the Olympic Stadium when it re-opens.
But as he announced the decision, Boris Johnson said that there was still "a lot of negotiation" before the deal was signed and sealed. That's likely to focus on who comes up with the millions of pounds needed to convert the stadium so it can host football and athletics.
This report is from our Political Correspondent Simon Harris.
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Mayor of London Sadiq Khan is backing the scheme.
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