FIFA have warned the Premier League against scrapping the transfer windows system.

A number of top-flight chairmen and managers are unhappy about the January slot but a senior FIFA source said the system was agreed with the European Commission, UEFA and players' unions and all bodies would have to agree to any changes.

The FIFA source told PA Sport: "The Premier League cannot impose unilateral changes to the transfer window - it would have to be agreed by all the organisations including FIFA, UEFA and the EC."

Blackburn chairman John Williams wants transfers only be allowed to take place in the summer.

Williams said: "I'm not a fan of the January window - but I'm even less a fan of the window being permanently open.

"I could be persuaded of the radical view of only allowing transfers in the summer unless there was an emergency need, for example for a goalkeeper.

"But I accept we could not do this unilaterally in the UK."

Sunderland chairman Niall Quinn is strongly opposed to the January window.

Quinn said: "In my time as chairman this has been the most demanding month - in fact it has surpassed all ridiculousness.

"The other day I heard someone say that football was losing the plot and I'm inclined to think that the removal of the January window might help the game to regain some sanity."