Former boxing world champion Herbie Hide has pleaded guilty to conspiracy to supply cocaine at the start of a trial at Norwich Crown Court.
The 42-year-old, who lives at Bawburgh, near Norwich, had previously denied the charges.
He has been released on bail.
Hide will be sentenced at Cambridge Crown Court on November 29.
Until then, he will have to report daily to Norwich police station.
More top news
After a night of thunderstorms across the East, this afternoon and this evening will stay calm, warm and sunny.
Two schoolboys have sent their favourite teddy bear up into the atmosphere.
A British family believed to have fled to Syria have joined Islamic State, according to a statement said to be released on their behalf.