Olsson has been unrelenting in his attack on Europe's G14 group

The G14 group represents 18 of the world's most powerful clubs.

Uefa chief executive Lars-Christer Olsson said: "They are creating a smokescreen to hide their ambitions for an alternative competition."

And he warned the G14's �740m claim for compensation in the Charleroi case over players injured on international duty needed to be taken "very seriously".

Belgian club Charleroi, backed by G14, are taking world governing body Fifa to court, claiming compensation over a player injured in an international match.

Moroccan Abdelmajid Oulmers was out for eight months after playing against Burkina Faso in November 2004.

G14 wants the regulations surrounding the compulsory release of players for international matches changed and clubs to be compensated if players are injured playing for their countries.

This is a challenge that everyone in football should take seriously Olsson on the G14 group

Olsson added: "I tend to judge people on what they do and not so much on what they say.

"So if you have a claim from the G14 clubs, written down on paper, in a court case in Charleroi, demanding �600m for compensation for players released for international duty then I take that very seriously.

"Now we hear they are asking for another �140m from Fifa for payment for players in the World Cup.

"G14 have tried to distance themselves from that figure but they have not withdrawn that claim from the court.

"This is a challenge that everyone in football should take seriously."