Lewis Hamilton has made the shock suggestion that he could quit Formula One at the end of the year following his win in the Emilia Romagna Grand Prix.
The 35-year-old, whose Mercedes contract expires next month, is now on the brink of securing a record-equalling seventh world championship.
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His victory on the sport's return to Imola after a 14-year hiatus took him 85 points clear in the standings with just 104 points available.
The Briton will match Michael Schumacher's all-time championship haul if he wins at the next round in Turkey on November 15.
Hamilton's boss Toto Wolff's future is also uncertain. The Austrian has overseen Mercedes' unprecedented run which saw the all-conquering team capture their seventh consecutive constructors' championship here in Italy on Sunday.
But when pressed on Wolff's plans for 2021, Hamilton said: "I don't even know If I am going to be here next year, so it is not really a concern for me at the moment.
"I would like to be, but there is no guarantee of that. There is a lot that excites me about Formula One's afterlife.
"We are in November and Christmas is not that far away. I feel great, strong, and that I could go on for plenty of months, but Toto mentioned about shelf life and there are multiple things on the top of my mind.
"I have been here a long, long time and I can understand him wanting to pull back a little bit and give more time to his family."
Lewis Hamilton’s F1 future uncertain
Only recently, Hamilton spoke about the possibility of continuing in the sport for another three years and it seems improbable he will walk away with a record-breaking eighth title likely to follow in 2021.
Nevertheless, it is curious that a new contract has not been agreed. Both Hamilton and Mercedes have claimed that formal discussions over a contract extension are yet to start.
"I guess if Lewis decided to step out of Formula One, which I don't think will happen, we are going to have a frantic driver market out there," said Wolff, 48.
"We are all happy but very tired and it is the same for me. I relate to his feeling that you question yourself and that you think about all the other things that matter.
"When you switch on the news in the morning, it is all about the struggles we face so it is normal for somebody to have these feelings. But we want to continue this journey. We are not finished."
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