Michel Platini has dealt a blow to any hopes FIFA may have of putting a quota on foreign players by declaring the plan "completely illegal".
It is understood Blatter will now use FIFA's Congress later this month to gain backing for a mandate to pursue discussion on the six-plus-five rule rather than seek a change to FIFA's laws via the Congress.
Under Blatter's plan, each starting XI must have a minimum of six domestic players and a maximum of five foreigners. He has no plans to impose limits on the number of foreign players in a squad, however.
Platini said in Moscow on Tuesday: "The objectives are very good, and I have said that many times.
"However, they are completely illegal under EU legislation.
"I will be having a meeting with Mr Blatter before the Champions League final about how he intends to deal with this matter at the FIFA Congress at the end of the month."
UEFA believe the way forward is through their licensing system, where clubs playing in European competition must have at least four players in the 25-man squad who have come through their academy and a further four trained at an academy within the same national association.
UEFA's system has fallen within EU rules because it does not judge the players on nationality, merely where they were trained.