Nico Rosberg has revealed that he has agreed a deal with WilliamsF1 for 2006, however, the German is unsure whether he will continue as 'third driver' or have a full race seat.

Talking to reporters in Shanghai, the German revealed that the deal was agreed earlier this week: "At the beginning of the week Frank Williams said I will be one of the three drivers for 2006. So at least I will be test driver next year and hopefully race driver. It will be decided in the next week or two."

With Mark Webber occupying one seat, and Nick Heidfeld heading to BMW, there has been much speculation over who would drive the second Cosworth powered car in 2006. Rosberg had been tipped as a likely contender, though his lack of F1 race experience has many believing that Antonio Pizzonia could slot in alongside the Australian.

Williams is playing it close to his chest, as ever, and says only that he will reveal his team's line-up in the next few weeks.

A Rosberg in a Williams would invoke memories of the 'glory days' of the early 80s, when Nico's father, Keke Rosberg, spent four seasons with the British team, winning the 1982 title.

"It would be Williams-Cosworth-Rosberg," said the German, referring to the package that his father drove to World Championship success. "That was a world championship-winning combination 24 years ago, so it would be very nice.

"I feel very much at home and want to be part of the team next year," he added. "Am I ready? Yes, definitely, 110% ready."