Stefan GP is reported to have signed a driver to complete its 2010 lineup.

Although without an official entry to race this season, the Serbian outfit is believed to have already signed the Toyota-backed former Williams driver Kazuki Nakajima.

At least one of the Cologne-designed Stefan cars has been painted Serbian national red ahead of its track debut, which according to rumours could now take place at the Barcelona group test next week.

Switzerland's Motorsport Aktuell reports that 26-year-old Indian GP2 driver Karun Chandhok, with $6 million of sponsorship in tow, may have been signed to be Nakajima's teammate.

It is believed that Chandhok's GP2 contract, valid for 2010, contains an exit clause in the event that a Formula One seat is available.

His father is Vicky Chandhok, a high ranking Indian motor racing official, with links to F1's governing body FIA.

Indian media reports late last year said Chandhok Snr has "a strong relationship" with F1 chief executive Bernie Ecclestone, as well as with "a host of top FIA officials".