Former lawyers Iain Robertson, 69, David Lyons, 71 and Alistair Blackwood, 68, were convicted alongside Mohammed Aziz, 61, and Robert Ferguson, 67, following a trial at the High Court in Glasgow.

All five denied any involvement.

The men funnelled some £1.5 million of dirty money through a client account of Mr Robertson’s law firm in Paisley – Robertson & Ross. The money laundering was part of a wider criminal enterprise that involved the hacking of a bank account of a football club owner.

About £985,000 was stolen from the owner of the club and deposited in the client account.

Alan Cameron, for the prosecution, said: “The man had never had any business or communication with Robertson & Ross.”

The trial followed a Law Society of Scotland investigation into the law firm.

The sum was sent back in two lots, while the Law Society was carrying out its inspection, but was later returned to the company client account.

The men were also found guilty of multiple charges under the Proceeds of Crime Act. Sentencing was deferred for reports.