Platini, the UEFA president, has so far refused to confirm whether he will stand when Blatter steps down in 2015, but the current FIFA supremo is convinced that he wants the job.
"Michel Platini is ready. If he wishes. He says 'I do not know'... but deep down, he wants it," Blatter said in an interview with France Football.
"He will be a good president of course. He will not be the same president as me, because everyone is different, but he will be good president."
Meanwhile, Blatter poured scorn on disgraced ex-FIFA vice-president Jack Warner's threat of a "tsunami" of revelations of malpractice involving Blatter at FIFA.
Warner claimed he was given World Cup TV rights for one US dollar in return for supporting Blatter's presidential hopes in 1998 and 2002.
Blatter confirmed that Warner had been given the TV rights from 1986 to 1998 for a dollar - but blamed the late Mexican FIFA vice-president Guillermo Canedo, a TV tycoon, and said it was nothing to do with him.
Blatter added: "From 1986 and until 1998 he was awarded the television rights for one dollar by Mr Canedo.
"Why? Because Mr Canedo wanted to keep the vice-presidency of FIFA and Mr Warner had a majority in CONCACAF."
He added in a separate interview in German magazine Kicker: "There is no tsunami. Jack Warner is claiming I assigned him the TV rights for Trinidad for one dollar when I was first elected in 1998.
"That's not true. We had no influence on the assignment of these rights. He acquired them in 1986 from OTI [Organizacion de Telecomunicaciones Iberoamericanas].
"But I do know what I've done wrong! I've taken FIFA out of the red, which was the situation when I became president in 1998, and into the black."