( CNN ) -- Formula One chief Bernie Ecclestone has reportedly cast doubt on the participation of two new teams ahead of the 2010 season , suggesting that a Serbian outfit will instead be on the starting grid in Bahrain . The Stefan Grand Prix team , owned by businessman Zoran Stefanovic , announced this week that they have already sent a container of equipment to Bahrain and will be testing drivers in Portugal later this month . Last year Stefan GP applied to take part in 2010 but missed out when Virgin Racing , Campos Meta 1 and U.S. F1 Team were handed places , and then Sauber salvaged a spot on the grid despite the pullout of BMW . Stefan GP have also announced a technical support deal with Toyota , who withdrew from F1 last year and have reportedly sold equipment and cars to the Serbians . Web site Autosport.com has reported that Stefan have been working with former McLaren chief designer Mike Coughlan , who was sacked in 2007 due to his involvement in the Ferrari spy scandal . Ecclestone told German sports paper Sport Bild that he doubted that Campos and US F1 would be ready for the opening race in Bahrain on March 15 . `` I do not believe in the participation of U.S. F1 and Campos , '' the 79-year-old said . `` Instead , I have good contacts with Stefan GP and would like to give this team a good starting point . Ralf Schumacher would be the perfect driver for them , he knows the team and he has experience . '' Schumacher , the younger brother of recently-returned seven-time world champion Michael , has not raced in F1 since leaving Toyota at the end of 2007 . He drove in the DTM touring car series in 2008 , finishing 14th . Autosport claims that former Williams driver Kazuki Nakajima will be involved with Stefan , who plan to launch their new car before tests at the Portimao circuit on February 25-28 . `` SGP Team will be testing with two drivers over three days . [ The ] identity of drivers will be announced in due course . First driver has already two years in F1 , '' Stefan said on their official Web site on Tuesday .
US F1 Team One chief Bahrain casts doubt on two new teams ahead of 2010 season . Ecclestone says he believes Campos Meta and US F1 Team will not be ready . He supports the introduction of Serbians team Stefan , who failed in entry bid . Stefan have already sent equipment to Stefan in anticipation of being involved in first race .