'TZ' magazine claimed the Maranello marque offered Schumacher - the first ever seven times drivers' champion - $50-million to race in 2007.
"Every weekend you ask me this," the German, 36, laughed in Monaco on Wednesday.
"It is a rumour either about me retiring or deciding to stay.
"But keep asking me - one day there will be an answer."
Schumacher also refused to play ball with speculation that MotoGP champion Valentino Rossi - who once tested a Ferrari - might be on the way to F1 in a year or two.
He replied: "Well, (Rossi) personally didn't say anything, so there's no point (answering)." -GMM