Sir Brian will address delegates

Mawhinney will speak at the European Football Finance Forum on Friday, where he will warn delegates about the problems transfer windows can bring.

"The existence of some League clubs could be put at risk if Fifa's intention is carried out," he said.

"If the freedom is restricted, clubs' financial health will suffer."

World football's governing body plans to restrict the movement of players between clubs during a season.

Currently, Football League clubs can continue to trade with each other and sign players from Premiership clubs during the transfer window.

"League clubs have traditionally relied on the flexibility to buy, sell or loan players whenever needed, for either football or financial reasons," Mawhinney said.

He added: "For some time we have been seeking to persuade Fifa not just to continue our dispensation to trade amongst ourselves on a year-round basis but also to allow us to trade on the same basis with Premier League clubs."

Transfer windows work to the benefit of Premier League clubs Football League chairman Sir Brian Mawhinney

Mawhinney will also hit out at an apparent U-turn taken by the Premiership clubs recently.

"Historically, Premier League clubs, aware of the damaging consequences of transfer windows on Football League clubs, had supported our position.

"Unfortunately, they decided recently to endorse the existing arrangements as they apply for their clubs. We are disappointed by their change of mind.

"Transfer windows work to the benefit of Premier League clubs.

"The market value of players has been skewed in their favour, to the detriment of Football League clubs."

But Mawhinney insists that the Football League "is not resigned to failure".

He added: "We will lobby the European Commission and look forward to further meetings with Fifa before it makes its decision in mid-December."