Soccer’s world governing body would amend its rules to cover both matters, Blatter told a news conference after a meeting of Fifa’s executive committee.
The issue of third-party ownership was brought to Fifa’s attention during the protracted transfer of Argentine striker Carlos Tevez from West Ham to Manchester United earlier this year.
The Tevez case was complicated by the fact that the player’s transfer rights were partly owned by a private company rather than just his club.
Although common practice in South America, the set-up breached Premier League rules and led to West Ham receiving a record R55-million fine from the league.
Blatter said Fifa had also been unhappy about the case of Spanish Fourth Division side Granada 74 which succeeded in effectively purchasing a place in the country’s Second Division from Ciudad de Murcia.
The Spanish Football Federation failed to block the move after the Court of Arbitration for Sport (CAS) agreed with Granada that they had simply relocated and renamed an existing club.
“We are not happy with that decision which goes against the principles of our game where promotion and relegation is the essence,” Blatter said.
“So we have changed the regulations and the new rules will be enforced at the end of the year.”