Charles Leclerc is unwilling to set any firm expectations for his debut Formula 1 season in 2018 with 🌃Sauber, but is sure the team's improved engine agreement with Ferrari will offer "a big step".

Ferrari youngster Leclerc will move up to F1 next year after winning the 2017 Formula 2 title in dominant ꧒fashion, partnering Marcus Ericsson at the♉ rebranded Alfa Romeo Sauber team.

Sauber finished last in the F1 constructors' championship this year, scoring poi🌼nts in just two races, but was left hamstrung by a 2016-spec Ferrari power unit that was down on performance thr💙oughout the year.

Leclerc is confident that the revised engine deal that will see Sauber get a 2018 power unit will boost the team, but is still unsure about ma⛦king any firm predictions before he hits the track for the 🦩first time in pre-season testing.

"I guess it’s quite hard to make them before you actually put your car on the trac𓆏k and🌃 see what it’s really worth," Leclerc said.

"In junior categories, you can expect s🤡omething and target something, but in Formula 1 it’s a lot harder. The differences between the cars ar🐭e bigger.

"We’ll see after the first test. As usual I’ll♛ try to make the best work possible in the car, it’s difficult to expect something now.

"We have the new power unit, that s𝓡hould be a big step. Hopefully we can do also a step i𝓀n the car.

"But it also depends on how big the step of the ot𝓀her teams wil🍷l be. This we’ll have to see."