Apr.15 (GMM) Norbert Haug has ruled out suggestions Nico Rosberg or Michael Schumacher could tire of Mercedes' push for pace and quit the German team.

The Brackley based outfit expected a better season in 2011 but is instead working to make the W02 car much more competitive.

Asked what chance Rosberg, who has been linked with Red Bull, or Schumacher could tire of the struggle and quit, competition director Haug told Bild newspaper: "None. Zero-point-zero.

"Our drivers don't quit when it gets difficult.

"Michael is the most successful racing driver of all time but even he spent most of his career fighting back. He won 91 races, but twice as many more he did not win," added Haug.

In an interview with German broadcaster RTL in Shanghai, Rosberg described Mercedes' current problems as "very serious".

"We are far from where we wanted to be, or thought we would be," he said.

"But when I ask Ross Brawn if this team as it is can win a world championship, he says quite clearly 'Yes'.

"I am very motivated to improve the situation," added Rosberg.

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