Hamburg - Red Bull team boss Christian Horner said on Tuesday that that their further Formula One cooperation with engine partners Renault is not fully secured yet. Horner said that "nothing is confirmed yet" and that Red Bull only named Renault as a likely engine supplier for the 2010 season to the ruling body FIA.
The FIA published the 2010 entry list on Monday, naming Renault as Red Bull partner.
The French carmaker will decide before the end of the year whether it will continue with its own Renault team in the sport. However, the company appears to stay in F1 racing as engine partner.
There was speculation that Red Bull would change its engine supplier to Mercedes. The Germans will equip McLaren and Force India and now have their own team as well, MercedesGP - formerly Brawn which won the drivers title from Jenson Button and the constructors crown.
Red Bull came second in the drivers list from Sebastian Vettel and also second in the constructors championship.
