The Austrian boss told reporters after Sunday's dramatic Sakhir Grand Prix, in which the seven-time champion's substitute George Russell excelled, that Hamilton's condition was improving every day.

But, he added, he had to complete a full recovery and return a negative coronavirus test result by Thursday - and, if not, super-sub Russell, on loan from Williams, would take his seat again.

"If Lewis recovers - and he is getting better every day - and he is being considered Covid-free and negative then he will be fine," said Wolff. "I think we need to see how well Lewis recovers.

"That's the most important - that he's well - and he says he's a bit better so he's made a big step.”

"If the test is negative, it's his car and then, I am sure, he will drive a brilliant race. But, if the test in Abu Dhabi is positive, then George is in the car."

Wolff rejected suggestions that the prodigious Russell's dazzling display for Mercedes – he looked certain to win the race until a pit-stop bungle and a puncture ended his challenge - was a useful factor in negotiating a new contract with Hamilton.

"No, they are two different things," he countered. "Lewis has been with the team for eight years. We have had great success in the past.

"He is a team member and I have said it already - none of the events will interfere or change any of our negotiations. That wouldn't be fair against him and it wouldn't be fair against us.

"It could have gone the other way around and been a race weekend where George wouldn't have been on the pace. Our negotiations go much beyond that."

Hamilton will be out of contract at the end of this season. Talks, postponed due to his illness, are expected to resume later this month.

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