The head of Fifa Sepp Blatter has written to the President of Brazil to express concern over the country's preparations for the 2014 World Cup.
It comes amid growing tensions between football's world governing body and the Brazilian Government.
President Dilma Rousseff has been quoted in the Brazilian press as having demanded a "frank conversation" with Blatter to discuss the issues.
Fifa has repeatedly warned the the Brazilian organisers about work delays.
It now seems those concerns, , extend to Fifa's legal demands on the host nation, with football's world governing body expecting to take total control of all aspects of the event.
One sticking point is believed to be the issue of ticket prices.
In Brazil students and elderly citizens get a 50 per cent discount for football matches and other forms of entertainment, and the Government wants the policy to be extended to the World Cup in 2014.
Another issue is Fifa's refusal to allow non-rights holders to show matches on television, with the Brazilians wanting local broadcasters to be given some limited access.