Marcus Ericsson says he is in the 'perfect environment' to progress as an F1 driver after joining Sauber from Caterham for the upcoming season.

The Swede forms an all-new driver line-up with Felipe Nasr, who makes his debut in F1 after racing in the GP2 series for the past three seasons. Sauber launched its 2015 car, the C34, ahead of the first official F1 test in Jerez which starts on Sunday.

Ericsson will debut the new car at the test and believes he is at the ideal team to continue improving as a driver after a tricky debut season with Caterham last year.

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"I want to continue to learn and establish myself as a Formula One driver and I have the feeling of being in the perfect environment to do so," Ericsson said. "In F1 it is difficult to have precise targets, as it depends on the overall package. It is clear that we want to be fighting for points."

Sauber itself suffered a difficult 2014 after failing to score a single championship point all season and finished a lowly tenth in the teams' standings.

Ericsson believes it will be a tough journey to get the team to the front end of the grid but is confident they can make positive steps forward in 2015.

"I am pleased about being a member of the Sauber F1 Team. After a difficult season, we want to move forward and fight in the mid-field like the team previously did."