Rosberg signs with Williams through 2010

(GMM) Nico Rosberg has signed a new contract to keep racing for Williams until at least the end of 2010, a German newspaper revealed on Sunday.

"Oh yes, thank you," the 22-year-old responded when congratulated on the new two-year deal by Bild am Sonntag.

"That was supposed to be a secret," he laughed.

"I am looking forward to two more years here with Williams."

Rosberg had been linked with a switch to McLaren, but was always firmly under contract to his Oxfordshire based employer for 2008.

The young German admits that his deal for next season, signed before he made his grand prix debut last year, is not particularly lucrative.

"I wanted to come into formula one at any price," Rosberg said. "Now Williams has decided to make me a great offer for 2009, and I have accepted it."

He says the financial terms of his new deal have improved "considerably".