"I don't know," the German said in Barcelona. "Is it (the rumour) coming from Italy? Maybe you should ask the Italians -- they seem to know more than I do."
Most paddock insiders believe that if there is any truth to the rumour, it is probably just a negotiating ploy ahead of Vettel's contract talks.
But would Ferrari really pair Vettel with Alonso, who quit the Maranello team amid some acrimony three years ago?
"I'm signing my contract, I'm not signing other people's contract, so it's not my decision," said Vettel. "But I'm ready to race whoever comes along."
"At the moment I have a contract with Red Bull, so unless some really strange things happen, my situation will not change," said the Australian.
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