The World Anti-Doping Agency has warned Fifa that it will not get special treatment over the drug-testing of its players.
Fifa president Sepp Blatter opposes the rule whereby players have to provide details of their location for one hour every day of the year.
But Wada president John Fahey said: “Fifa has no special concession in the area of whereabouts.
“We acknowledge this particular standard is in its early stages and like anything in the code we are always interested in feedback,” he said.
“We need to ensure that there is a proper examination of the code that everyone including Fifa signed up to before we start contemplating what should be changed.
“There are lots of things in sport or business that inconvenience us and these rules are to prove that we have clean sport.
“I think it’s a small price to pay for the outcomes that we seek.
“Let’s give it a good run and have a decent test with a proper time factor built in.
“I’m disappointed with Mr Blatter’s statements, many of which are simply wrong. I have endeavoured to engage with him and I hope to do so in the next few days.”
Blatter is against a rule which he claims assumes guilt on the part of the player.
He said: “We are in a situation in which all are accused. That doesn’t fit my understanding of law.
“Every sportsperson is, in the sense of the WADA code, suspected of doping, therefore accused. That’s not right in our society.”