George Russell will get behind the wheel of a Mercedes this week as speculation around a Formula One promotion persists.

Russell is widely considered to be vying with current Mercedes driver Valtteri Bottas for a seat next season.

And the Williams man will get the opportunity to join the team in Hungary on Tuesday to test the 18-inch tyres that will be used in 2022.

Russell was part of Mercedes' junior driver programme before getting his F1 opportunity with Williams and has tested for the Silver Arrows previously.

The 23-year-old even stood in for Lewis Hamilton at the 2020 Sakhir Grand Prix when the world champion had tested positive for coronavirus.

A pit-stop mix-up cost Russell the victory on that occasion, but a ninth-placed finish secured his first points.

The Bottas rivalry will draw extra attention to Russell's performance this week, though, coming straight after his best ever result at the Hungarian Grand Prix.

Russell finished eighth, earning points with Williams for the first time.

Bottas had started from second after a record-equalling 80th qualifying one-two for Mercedes, but he crashed on lap one in a chaotic start.

Lewis Hamilton has confirmed he has held "positive" talks with Mercedes over his future.

Speculation surrounded Hamilton for the majority of the 2020 Formula One season as he won a record-equalling seventh drivers' championship.

The Briton returned to Mercedes for this campaign but only signed a one-year deal, meaning he is again out of contract at the end of the year.

Hamilton is engaged in a gripping title tussle with Max Verstappen, who leads the championship for the first time in his career.

P7, P15 and P2 finishes across the past three races have opened up a 12-point gap at the summit.

Only in 2016 (five, twice) has Hamilton gone longer without a victory since 2014, but the Silver Arrows remain keen to keep their prized asset on board.

"[There is] not a lot to say too much on, but we have had discussions and things are positive," said Hamilton ahead of the Styrian Grand Prix.

Should he wish to commit to Mercedes, Hamilton is assured of a seat, having claimed 98 wins and 100 poles in his F1 career – two records.

Team-mate Valtteri Bottas is less secure, with Mercedes' team principal openly discussing the option of promoting George Russell.

But Hamilton said: "Valtteri is my team-mate now. Both of us have had ups and downs in our careers, but he is a fantastic team-mate and I don't necessarily see that it needs to change.

"We have worked well for many years. Valtteri has been my best team-mate overall, and when I say team-mate it's not just driver performance, it's about team morale and how you work in the team-mate environment."

On Russell, who drove for Mercedes in Hamilton's place late last season, the reigning champion added: "He's not my team-mate currently, so [there is] no need to say anything on it."

George Russell hopes Williams can make a flying start to the Formula One season in Bahrain - but he believes Mercedes are the only team who will be sure they are race-ready.

British driver Russell caught the eye when he replaced Lewis Hamilton at Mercedes for one race last year, after the world champion tested positive for COVID-19 and missed the Sakhir Grand Prix.

He went close to winning that race until a pit-stop error and a puncture late on cost him a probable victory, and he then returned to his regular drive at Williams.

Mercedes have assured Russell, who is part of their junior driver programme, that he can have a racing future with them if his development continues as expected.

That could come as soon as next year, but for now Russell's focus is on delivering for Williams.

The team has been in transition following the takeover by Dorilton Capital, and German motorsport veteran Jost Capito was appointed chief executive officer during the close season.

Russell believes Williams, who failed to score a point last season, should be better placed in 2021 to at least improve on that disappointing outcome.

"We want, the bare minimum, to be fighting with the Haas and the Alfas, as we did last year, and closing the gap to that midfield," Williams said.

"We made nine out of 17 Q2 appearances and that is definitely a thrill. That's got to be almost an aim every weekend for myself and team."

The season begins in Bahrain on March 28, and by then there should be evidence of which teams have made progress since 2020, with testing taking place, also in Bahrain, on the March 12-14 long weekend.

Russell admits it is a waiting game to see how rivals have advanced, or regressed.

"Fingers crossed that they go backwards and we go forwards," he said, in an Instagram chat on Formula One's official page. 

"Ultimately, we may go to Bahrain and see every other team has progressed more than us.

"We may go there and see we've made great progress. Until we get to Bahrain not a single team, probably bar Mercedes, can tell you how they're going to perform."

Russell, 23, has been tipped for a big future in the sport. He also believes Williams, a great name from the history of Formula One, can begin a journey back to the top of the sport.

"The arrival of Jost is massive for the team, really exciting," he said. "The future for Williams and everybody here at Grove [the team's headquarters] is really great.

"Unfortunately, things don't change in a matter of moments in Formula One, but the building blocks are really getting set in stone.

"Jost has loads of experience, he's a great character, and I think he's going to bring a lot of motivation to the team."

Russell was speaking on the day F1 chiefs confirmed the Portuguese Grand Prix on the new season's calendar, with the race inked in for May 2.

It will be the second round of 23 in the championship, with Portugal having returned to the Formula One rota last year for the first time since 1996.

George Russell has no intention of "hassling" Mercedes over his future as he focuses on trying to get the most out of a new-look Williams car in 2021.  

The British driver is heading into the final year of his contract with Williams, where he will once again work alongside Nicholas Latifi for the season.  

It will be a third year for Russell with the team, though he did step in to drive for Mercedes - having previously been part of their junior driver programme - at the 2020 Sakhir Grand Prix, replacing Lewis Hamilton after the seven-time world champion tested positive for COVID-19. 

His performance in the race - he was in front for the majority before a slow puncture forced him to settle for ninth place - led to speculation over a permanent switch, but Hamilton and Valtteri Bottas have remained together.  

While a move could still happen at some stage further down the line, Russell is relaxed over his standing within Mercedes.  

"Mercedes and Toto have always had my back and believed in me from day one. When they believe the time is right, the time will be right," he told Sky Sports at the launch of Williams' FW43B car.  

"I'm not hassling them, I’m just going out there and doing my job on the track. What comes in the future will come.  

"Obviously I had a great opportunity in Bahrain last year, but for now we will focus on the job here at Williams for this season and trying to get the most out of it."

In a somewhat surprising move, Hamilton only agreed to a one-year extension earlier this year, committing him to a ninth season with Mercedes.

Bottas' deal runs "at last until the end of 2021", per the team's statement when the Finn's future was revealed last August, so Russell could potentially be considered to replace either driver in 2022.

"Every driver wants to put themselves against the best," he said when asked if forming a partnership with Hamilton appealed to him.

"I believe in myself and Lewis is the benchmark at the moment, but equally you have a lot of fantastic drivers out there who might not have the same CV as Lewis.  

"Max [Verstappen], Charles [Leclerc], Lewis – they are all on the same level. Putting yourself against one of those three would be great for any driver."

Williams - now owned by Dorilton Capital - unveiled a new blue, white and yellow livery on Friday that takes inspiration from the team's successful cars in the 1980s and 1990s.