Blatter voices concern over G14
Fifa president Sepp Blatter wants Europe's national associations to stand together in the face of legal challenges from top clubs.
The G14 group, which includes Arsenal, Liverpool and Manchester United, wants changes to the Champions League and money from major championships.
Blatter said such moves have "disturbed the family of football".
He said: "We offer them everything and then we find ourselves being attacked. It is unjust."
G14, which represents the interests of 18 of Europe's biggest clubs, wants to give its members a bigger say in how the game is run.
While the group has denied wanting to break away from the Champions League, it is supporting Belgian club Charleroi in their legal battle to gain compensation from Fifa after Abdelmajid Oulmers suffered a serious injury while away on international duty.
However, Blatter sees the growing power of the G14 clubs as a threat to national teams.
He said: "The wonderful pyramid of football would crumble because of the prestige and elitism of some.
"Once you are in a family, there is a minimum of respect that one should observe."
His concerns have been echoed by Uefa president Lennart Johansson.
He said: "We believe in open competitions based on the promotion and relegation system and the decisive role of sporting results.
"By what right can the members of a small group of clubs flout the fundamental principles of democracy by pompously declaring themselves to be 'the voice of the clubs'?"
