Charles Leclerc is unwilling to s🎃et any firm expectations for his debut Formula 1 season in 2018 with Sauber, but is sure the team's im💞proved 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 fashion, partnering Marcus Ericsson at the rebranded Alfa Romeo Sauber team.

Sauber finished last in the F1 constructors' champions🐠hip this year, scoring points in just two races, but was left ✤hamstrung by a 2016-spec Ferrari power unit that was down on performance throughout the year.

Leclerc is confident that the rev๊is෴ed engine deal that will see Sauber get a 2018 power unit will boost the team, but is still unsure about making 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 track and see what it’s really worth🌳," Leclerc said.

"In junior categories, you can expect something and target something, but in Formula 1 it’s a lꦛot harder. The 🌠differences between the cars are bigger.

"We’ll see after the first test. As usual I’ll try to make the best wor😼k possible in the car, it’s difficult to expect somethi𓆉ng now.

"We have the new power unit, that should be a big s⛎tep. Hopefully we can do also a step 🌺in the car.

"But it also depends on how big the step of the other teams will be. This we’l🔯l have ꧑to see."