Kimi Raikkonen will test the 2010-spec Lotus at Valencia's Ricardo Tormo circuit on January 23-24. The Finnish driver last drove a Formula 1 car in 2009 when he drove for Ferrari.
He is upbeat about his F1 return with Enstone based squad, but added that the new Pirelli tyres would be hard to crack.
"I don't think I've lost any speed," he told the Lotus official website. "Getting on top of the tyres will be the hardest thing, of course, but I'm not really worried.
"We don't test the new car until February, so it's a long wait. However, I should be able to jump into a two-year-old F1 car in January.
"Learning Pirelli's tyres will be the most important job as it's a different approach from what I experienced before."
Pre-season begins at Jerez on February 7-10.