Bruno Senna and Romain Grosjean have been named as part of Renault's test and reserve lineup for 2011.
Grosjean used to be a Renault protege before his disastrous part-season in Formula 1 with the squad following Nelson Piquet's firing in mid-2009. Having lost his place in F1, he raced in World GT1, won the inaugural Auto GP title and returned to GP2 last year.
His career is now being managed by the Gravity organization run by Renault team owner Genii, and he will dovetail his renewed F1 role with a full season in GP2 with DAMS.
"For sure it's a great feeling," said Grosjean. "I think it's the best option for me to get back in a [Formula 1] racing car in 2012."
Senna joins the Renault roster having raced for HRT in F1 last season.
"It's a great leap of faith from them to give me this shot, so I'm very happy," said Senna. "I'm very excited. I hope this year can get better and better."
Renault has also retained Ho-Pin Tung and Jan Charouz, both of whom were part of Gravity's driver development program last year, and has added former Lotus third driver Fairuz Fauzy.