In a statement provided to the AP, FIFA said that Blatter had "confirmed in letters sent to Real Madrid CF as well as the Portuguese Football Association that Cristiano Ronaldo is an exceptional player - as he had already mentioned at the Oxford University event last Friday, and on many other occasions''.
While slighting Ronaldo during the public event, Blatter said he preferred Messi, the Argentina forward who has won Fifa's world player of the year award for the past four years.
Ronaldo won the award in 2008, finishing second in voting behind Messi in 2009, 2011 and 2012.
Ronaldo took Blatter's stinging words, and mimicry, to heart, and apparently wasn't convinced by Blatter's attempt at making amends.
"This video shows clearly the respect and consideration that Fifa has for me, for my club and my country,'' Ronaldo wrote on his Facebook page late Tuesday. "Much is explained now. I wish Mr. Blatter health and a long life, with the certainty that he will continue to witness, as he deserves, the successes of his favourite teams and players.''
Earlier on Tuesday, Fifa included Ronaldo and Messi on its list of 23 finalists for this year's world player of the year award. The list will be pared down to three players in early December.
"Messi is a good boy, that every father and every mother would like to have at home,'' Blatter told the Oxford crowd. "He's a kind man, a good boy. That's what makes him so popular, and naturally he'll always get a lot of votes because he plays well and scores goals.''
Then, while comparing Messi and Ronaldo, Blatter made a joke about Ronaldo's hair.
"They don't have the same attitude and that gives life to football. One has more expenses for the hairdresser than the other but that doesn't matter,'' Blatter said.
Ancelotti defended Ronaldo's character.
"I completely agree with the president (Perez),'' Ancelotti said. "I haven't spoken to Ronaldo about this. I think he shows every day and in every match that he is a serious and professional player that respects everyone.''
Ronaldo also received support in Portugal.
Portuguese football federation president Fernando Gomes said Ronaldo is "often misunderstood because he's forthright and honest,'' and that his frankness sometimes "gives rise to a negative image which isn't him.''
The spat is bound to strengthen the belief among some Madrid fans and sections of the Madrid-based sports media that Fifa has a bias for Barcelona and Messi.
Former Madrid coach Jose Mourinho snubbed Fifa's awards gala for the past two years while he was at the Spanish club, as did Ronaldo in 2012. Mourinho accused Barcelona of receiving help from Fifa referees in ousting Madrid from the 2011 Champions League semifinals.
-AP