Marcus Ericsson says he has fond memories of the Russian Grand Prix despite it marking his former team Caterham's final Formula 1 Grand Prix.

The Swedish driver made the switch to Sauber last winter as Caterham fell into serious financial trouble which meant it was unable to see out the final three races of the 2014 campaign, bringing a premature end to Ericsson's season.

Despite the fallout after Sochi and the ultimate extinction of Caterham, the 25-year-old says he had a positive experience at the inaugural Russian Grand Prix 12 months ago.

"Last season the Russian Grand Prix was my last race both with Caterham and for the year," Ericsson said. "Qualifying wasn't so bad, and then I also had a decent race, so I have good memories of this track.

"Hopefully the second Russian race will be a positive weekend for me with Sauber. But we have to work hard to optimise our updates that we have brought to Singapore, and try to make them work even better. And, of course, our aim is to score points again."