Charles Leclerc has been putting in the hours to ensure Ferrari bounce back from their worst season for 40 years.

In 2020, Leclerc finished eighth in the drivers' standings, with 98 points and two podiums to his name.

Even that fairly meagre return meant he fared better than Sebastian Vettel, who had 33 points and a solitary podium down in 13th.

The former world champion has joined Aston Martin for 2021 following the lowest points total of his career, with Carlos Sainz in place as Leclerc's new team-mate.

The Monegasque was cautiously optimistic at Friday's season launch, having left few stones unturned during the off-season, but he knows it is foolish to predict how a wounded Ferrari might fare against Formula One's other heavyweights.

"There has been a lot of work. We have been pushing quite a lot," he said.

"It always looks positive on paper but then we need to see what the others have done as a step.

"I have never been in [the] Ferrari [factory as much] as before this season. We have been doing quite a bit of tests with the old car. I feel very ready.

"I have been working in a similar way as in the past, trying to understand what my weaknesses were last year.

"I still believe tyre management is something I should push. I improved a lot last year and I hope there will be another step this year."

Last month, Leclerc was forced to put such intensive preparations on hold as he self-isolated having tested positive for coronavirus.

However, he offered assurances that there have been no lingering effects.

"COVID did not hit me that bad," said the 23-year-old. "I did some physical tests to make sure everything came back to normal and that is the case."

Having comprehensively out-driven Vettel as the younger man, Leclerc anticipates a different dynamic when Sainz – fresh from two seasons at McLaren – joins him on the grid for the 2021 opener in Bahrain on March 28.

"It is very clear we need to push for the team," he added.

"Carlos wants to beat me and I want to beat him too. We will try to be careful when we fight each other on track.

"What is most important is we separate what happens on the track and off the track. It is a fine line that every team-mate needs to find.

"Carlos is very competitive but he is also here for the benefit of the team, as I am. We will have to play it smart on that one."

Ferrari driver Charles Leclerc has tested positive for coronavirus, the team have confirmed.

The 23-year-old was already isolating having been in close contact with someone who had contracted COVID-19.

Ferrari said Leclerc is isolating at home in Monaco and is displaying mild symptoms.

A team statement read: "Scuderia Ferrari Mission Winnow driver Charles Leclerc has tested positive for COVID-19.

"In accordance with the team's protocols, Charles is tested regularly and yesterday, the result from his latest test came back positive. 

"Charles notified us immediately and has informed everyone he has been in close contact with in the last few days.

"He is currently feeling ok with mild symptoms and is now self-isolating at home in Monaco."

Leclerc added on his Instagram stories: "Hello guys. I hope you are all staying safe.

"I want to let you know that I have tested positive for COVID-19. I am regularly checked according to my team's protocols.

"Unfortunately, I learned that I have been in contact with a positive case and immediately went into self-isolation, notifying anyone I had contact with. A subsequent test I took has come back positive.

"I am feeling okay and have mild symptoms. I will remain in isolation in my home in Monaco in compliance with the regulations set by the local health authorities.

"Stay safe and take care."

World champion Lewis Hamilton tested positive towards the end of the 2020 F1 season, while Lance Stroll and Sergio Perez have also previously missed time due to coronavirus.

Ferrari do not regret their failure to sign Lewis Hamilton for the 2021 season as they are confident Charles Leclerc can challenge the Formula One champion.

Hamilton has won six of his record-equalling seven world championships with Mercedes, although he has not yet committed to the Silver Arrows for the coming campaign.

A resolution is expected soon, but links to rivals Ferrari have never been far away.

A blockbuster move will not materialise on this occasion, however, as the Scuderia have secured Carlos Sainz Jr next to Leclerc in their 2021 line-up, replacing Sebastian Vettel.

And team principal Mattia Binotto is confident they have made the right move.

He told Sky Sports: "I don't think there will be regret because, at the end, when we took some decisions, we took them thinking they were the right decisions and today we have a fantastic driver like Charles, where we invested a lot as Ferrari.

"I think he's got a lot of talent. If he's got the right car, I'm pretty sure he can challenge Lewis Hamilton.

"We've made our choices and I think, together with Carlos, we are very strong. I don't think there will be any regret."

Although Leclerc - fourth two years ago with two wins to his name - would appear the obvious Ferrari contender, Binotto is not naming a "number one".

Sainz finished seven points better off than his new team-mate in 2020 while still with McLaren.

"There is not a number one and number two," Binotto said. "They will have equal opportunities - certainly at the start of the season. I'm pretty happy then that they are free to fight.

"I think what we have to do as usual is to optimise the team points, and when you optimise the team points, normally you are optimising the drivers' points as well. Team points is the number one.

"Later in the season, let's see how things will progress, let's see what objectives individual drivers can maybe achieve and if we need to adopt a different strategy, but at the start of the season, they will be free to fight."

Carlos Sainz compared Ferrari and McLaren to LaLiga heavyweights Real Madrid and Barcelona, and is confident of a successful transition to the Scuderia. 

The Spaniard spent the past two seasons at McLaren, making the podium on two occasions, but is Ferrari-bound for 2021, replacing Sebastian Vettel.

Sainz spoke about how the objective for both teams is to cut the gap to dominant Mercedes, while he feels the fact he will have raced for both teams proves he is doing something right in his career.

Asked by AS if racing for Ferrari is like playing for Real Madrid, the team Sainz supports, he replied: "It's one way of saying it…but McLaren is Barca, which is also a very good team to be on. 

"It cannot be compared, because in addition both are in a restructuring to try to dethrone Mercedes in the future. 

"But they are the two best teams in history and when you go from one to the other it means that you are doing something right in Formula One."

At Ferrari, Sainz is joining a team where the pressure is always on to be a success and internal politics have historically always been a lingering presence in the background.

But Sainz is confident of being able to bring a harmonious atmosphere like the one he was part of at McLaren.

"That I managed to do it at McLaren means I can do it at Ferrari. If I could create a good team, generate good dynamics at McLaren, why not do it at Ferrari? I can do it," he added. 

"I like the people out there, I like Mattia [Binotto, Ferrari team boss] and I like what I see, what we have talked about. 

"There was no hesitation when it came to signing the contract and going forward. In my head there is no possibility that this environment and similar situation cannot be generated. 

"If I could at McLaren, I can at Ferrari."

Sainz's predecessors at Ferrari Vettel and Fernando Alonso arrived with huge reputations as two of the most gifted drivers of their generations and with world titles to their name.

Neither man was able to end Ferrari's wait for a champion dating back to 2007 but Sainz believes it is wrong to judge their success at Maranello based on titles.

"They leave with a few victories and podiums, if you call that going empty…I only have two podiums," he said. 

"Are they leaving without a championship? Yes. But the same has happened to nineteen drivers, every season for the last 10, when Red Bull or Mercedes have dominated. 

"There are nineteen drivers a year who have gone empty, but I do not include those who have raced for Ferrari. Nobody leaves Ferrari empty."