The Uefa president has expressed his joy with the Bianconeri's Serie A success, but warned them that playing in Europe's elite competition is something completely different
Nevertheless, the former France international was unsure as to whether Juventus have the quality to fight for Champions League glory in the 2012-13 campaign.
"I am obviously neutral as Uefa president, but my heart still beats for Juve and I'm very happy for them. Their success is well deserved and I congratulate them with it," Platini stated in an interview with La Gazzetta dello Sport.
"The Champions League? Winning domestically is something completely different than winning in Europe. I honestly don't think Juve can win it straight away. They need time to grow. Things were easier this year because they were in only one competition."
Platini wore the Juventus jersey from 1982 until 1987.