The Australian has only a one-year contract with Red Bull, although team figures have indicated a new deal for the 35-year-old is likely.
Webber scoffed at the Ferrari rumours.
"It's like someone clicks a switch in May and says, 'Oh, Mark's off to Ferrari'," he said, with the Evening Standard revealing Webber shook his head whilst answering.
"I'm used to this stuff ... I'd say 80 per cent of what you hear is bulls**t."
Webber admitted he might have been close to retirement at the end of last season, following a difficult campaign when his teammate teammate Sebastian Vettel utterly dominated.
"I was cooked, mate," he said. "At the end of last year, I needed to recalibrate and reset.
"As a sportsman I was a bit burnt out."
His season-ending victory in Brazil, however, was a good foundation to bounce back.
"The best winter I've ever had, mate," said Webber. "I felt like I was flying after it."
As for who will be champion at the end of topsy-turvy 2012, he insisted: "Not a clue mate. Me."