Mercedes motorsport boss Norbert Haug says the company is getting a 'bit grumpy' following its lack of success during the 2010 F1 season.

Having purchased the title-winning Brawn GP team over the winter, Mercedes went into the season hoping to fight for the championship with its line-up of Nico Rosberg and Michael Schumacher.

However, Rosberg has managed just three podium finishes so far this season while Schumacher has struggled on his return to the sport and has finished inside the top six on just three occasions - the last of which came in Turkey at the end of May.

With Mercedes having now switched focus to its 2011 car, the team will hope to return to the front next season but Haug admitted that the lack of results this year had been a disappointment.

"We know how it feels to win so we are sometimes perhaps a bit grumpy," he told Cologne's Express newspaper. "We will make a step forward in 2011. And of course we need to have the best possible staff, which may include hiring new people.

"In 2011 the drivers will be Michael and Nico Rosberg. And we believe in Ross and the team."


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