George Best (59) was seriously ill last night in an intensive care unit.
The former Manchester United and Northern Ireland forward was unconscious and on a ventilator at the Cromwell Hospital, west London, where he was admitted nearly four weeks ago.
Prof Roger Williams, who has been in charge of Best’s treatment since he underwent a liver transplant in 2002, said: "Quite what will happen over the next 24 hours is difficult to say.
"He could pull through, or he could get worse."
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Best, who is suffering from internal bleeding of the bowel, has been unconscious since Wednesday morning when he was sedated to be put on a life-support machine