AC Milan have also expressed an interest in the 17-year-old Internacional forward.
"I don't know about Milan's negotiations," said Inter coach Roberto Mancini. "But in any case we have been following Pato for the past two years. He was very young the first time we saw him and I don't think many knew him then.
"He is an intelligent kid, he is aware that to leave home right now it would be very challenging. We will see what he does. He knows that at Inter he could find a family atmosphere that would help him, an atmosphere where he could become a star.
"There's no doubt that he has the quality to become a very good player."
Milan are eager to acquire a new striker but the £10million-rated Brazilian starlet is considered too expensive for the Rossoneri.
Pato won the Copa Libertadores and the FIFA World Club Championship last year and has been widely touted in the Brazilian media as the next Kaka.
He was recently in action for Brazil at the Under-20 World Cup in Canada and is under contract at Internacional until 2009.