There is speculation that Jose Mourinho could be signed up by Manchester United, following the news of Alex Ferguson's retirement.
If so, it will put an end to rumours that the Real Madrid boss was planning to come back to Chelsea - where he was in charge between 2004 and 2007.
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The boy was attacked on a bus in south London. Police say he was stabbed in the stomach.
The ComRes survey for ITV News and LBC showed the Labour candidate increasing his overall lead over Conservative rival Zac Goldsmith.
The latest poll for ITV London and LBC shows Sadiq Khan leads Zac Goldsmith by 45% to 36% on first preference votes.