The 17 year-old attacker left Chelsea a year ago for Liverpool after coming off scholarship forms with the Blues.
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Chelsea and Liverpool have now been haggling over a fee for Ngumoha, with the Premier League having been forced to step in.
A tribunal - a year on since Ngumoha's departure - has been set up, though for now no fee has been settled.
And after the teen's matchwinning performance in victory over Liverpool on Sunday, Chelsea believe they can demand an even higher price than previously believed, says the Daily Mail.