George Russell completed a fairytale week by finishing fastest in practice for the Sakhir Grand Prix with Lewis Hamilton "in bed" and "not feeling great".
The penultimate round of the season will be the first Formula One race staged in 14 years without Hamilton after the seven-time world champion's positive Covid-19 test on Monday.
Indeed, Hamilton's victory here in Bahrain last weekend might have been the 11th and final of his title-winning year with the Briton's mandatory 10-day quarantine period ending on Thursday.
The season finale takes place in Abu Dhabi next Sunday. But strict Covid protocols are in place with Yas Island effectively placed on lockdown when the F1 world arrives from Bahrain on Monday evening.
"I am not sure Lewis is going to follow in detail what is happening on track this weekend as he is in bed and not feeling great," said Toto Wolff, the Mercedes team principal.
"He is recovering. The first few days are critical when you have corona, and while he has symptoms, they are pretty mild. Racing becomes a second priority. His priority now is getting healthy."
Hamilton, 35, came into contact with an infected person following a holiday in Dubai in the days before last weekend's race in Bahrain.
It leaves the world champions without their £40million-a-season driver for one, possibly two races, but Wolff added: "Lewis doesn't need any permission to go to Dubai.
"George is totally relaxed," added Wolff. "He comes across on the radio as chatty and buzzing, but he is very focused, and calm.
"The record he has of winning the GP3 and F2 championships, both in his rookie years, stand out.
"I remember he came to my office when he was 15 or 16 and he was wearing a black suit and a black tie with a PowerPoint presentation as to why Mercedes should support his career.
"He is very mature for his age and his personality is well-suited to jump in the car in such a high-pressure situation. But let us keep both feet on the ground. These cars have not been taken out in anger yet."
A strong performance from Russell would place pressure on Wolff to hire him in 2022 alongside Hamilton. Bottas is already confirmed for next season.
But Wolff concluded: "You cannot call it a shootout (between Russell and Bottas) when it is about one or two races.
"If George does well it is an indication that one day he is going to be in a good car and race for victories and world championships but that is far away.
"Where we are in 2022 is not going to depend on George's performance on an oval in Bahrain or a season-ending race in Abu Dhabi."
