Former Virgin driver Jerome d'Ambrosio will be the third driver for Lotus during the 2012 season.
The F1 driver's career is handled by Gravity, the management arm of the former Renault team's owners Genii.
He will "attend all races" in 2012 and be ready to replace either Kimi Raikkonen or Romain Grosjean if required, Lotus said in a statement.
CHOICES
D'Ambrosio said: "Of course, I would love to be racing, but racing with a top team. Being associated with Lotus F1 team should be more beneficial and this is the choice I have made."
D'Ambrosio was the Enstone-based team's reserve driver in 2010, before making his grand prix debut in 2011.
Just before the Lotus announcement, his manager Benjamin Mignot told Le Derniere Heure: "They (Lotus) are conscious that if they are going to announce Jerome as the third driver, they should do it before HRT reveals its second driver."
The F1 driver's career is handled by Gravity, the management arm of the former Renault team's owners Genii.
He will "attend all races" in 2012 and be ready to replace either Kimi Raikkonen or Romain Grosjean if required, Lotus said in a statement.
CHOICES
D'Ambrosio said: "Of course, I would love to be racing, but racing with a top team. Being associated with Lotus F1 team should be more beneficial and this is the choice I have made."
D'Ambrosio was the Enstone-based team's reserve driver in 2010, before making his grand prix debut in 2011.
Just before the Lotus announcement, his manager Benjamin Mignot told Le Derniere Heure: "They (Lotus) are conscious that if they are going to announce Jerome as the third driver, they should do it before HRT reveals its second driver."