Glasgow lightweight Barry Hughes is at the centre of Scotland's biggest police probe into dirty money.
Hughes, 25, is being investigated by police, who last week froze £3 million in assets belonging to Russell Stirton.
Millionaire Stirton, 44, is a key lieutenant in the McGovern crime clan north of the border. His filling station in Springburn, Glasgow, was the first stop for officers who raided 11 homes and businesses.
The garage sold the cheapest fuel in Britain as a cover for laundering the McGoverns' dirty money from the country's £1 billion a year drugs trade.
It has now emerged officers also called at the home of Hughes, nicknamed "Braveheart", and also searched his father's home in Bishopbriggs.
A police source said: ''We are scrutinising the business dealings and relationship between Hughes and Stirton. There is a lot of work to be done.''
Hughes, Scotland's number one lightweight till he lost in a Scottish title fight to Martin Watson last May, enjoys a luxury lifestyle but insists he made his money through car sales and property deals.
The revelation that Hughes is under investigation will stun Scottish boxing.
One associate said: ''Barry is young, intelligent, very well-dressed and a gentleman.
''He is very popular and when he fought in England he took a huge amount of fans from Glasgow.
''It would be wrong to call him a gangster just because he's got a few quid.''
The Scottish Drug Enforcement Agency, Customs and the National Criminal Intelligence Service joined forces last Wednesday in Operation Maple.
Within hours, officers had seized around £3 million in assets.
Stirton's £500,000 house in the village of Mugdock, north of Glasgow, was raided, along with his Springburn service station.
Officers had to use heavy machinery to dig a secret safe out of the ground at the garage after Stirton claimed that he could not find the key.
As for Hughes, he lives in a £270,0000 home in the upmarket village of Brookfield, Renfrewshire, with his air stewardess wife Jacqueline, whom he married last year. He also owns a £170,000 home in Newton Mearns and a £60,000 flat in Ibrox.
Hughes held his stag party in Las Vegas and had his wedding reception at the five-star Gleneagles Hotel in Perthshire.
His cars include a Porsche Cayenne Turbo four-wheel-drive worth £80,000.
The flash fighter was a prominent guest at a charity boxing night staged last year at Glasgow's Radisson Hotel and attended by many underworld figures.
Hughes hosted a table and blew more than £15,000 in the charity auction.
He also had lengthy conversations with the organiser of the event, boxer Paul Weir, who was jailed eight months later for drug-dealing.
The financial side of the event is currently being investiagted by Scottish tax officials.