The Premier League's inquiry into allegations of corruption in football will target 39 transfers involving eight clubs and will tackle unco-operative agents.
Inquiry chief Lord Stevens confirmed his team may use Football Association rules to force agents to open their bank accounts for inspection. Fewer than half of the 150 agents contacted by Lord Stevens' firm Quest have cooperated with the inquiry.
Lord Stevens will also be given all the evidence uncovered by the BBC's Panorama programme, in their undercover investigation into illegal payments.
As part of his investigation, the former Metropolitan Police commissioner looked into all 362 transfers in the Premier League between January 1 2004 and January 31 2006. He will be given a further two months to probe the 39 - 11 per cent of the total - that remain open to question. Roughly half of those involve foreign transfers, and half domestic transfers.
The identities of the clubs involved and the transfers remain secret - but if they are deemed to have involved illegal payments Stevens will pass details to the Premier League, FA and if necessary the police. Lord Stevens said: "We will do everything we possibly can to find out the truth; I promise that."
He briefed a meeting of Premier League chairmen on the first seven months of the inquiry - but decided to make no recommendations on changes to regulations until the investigation is completed. He stressed, however, that these would be vital for the game.
He added: "It's essential for the game to ensure there's a process to prevent the type of things being alleged, and to give the public confidence. It has to be sorted out in the public interest and in the interest of genuine fans."
Lord Stevens said that only 65 of 150 agents contacted had responded to an invitation to meet investigators. The FA confirmed they had the right to request information from FA-licensed agents' bank accounts under their "powers of inquiry" - and those failing to do risked a misconduct charge.