From GMM

German car manufacturer Mercedes-Benz may soon have to turn its attention to making some personnel changes within its Brackley, UK based Formula 1 team.

That is the warning of the German marque's competition director Norbert Haug, amid reports the Brackley outfit is now working almost exclusively on its 2011 car.

"We hope to return to success," he is quoted by Autosprint.

"However, if we fail to achieve the goals we have set, we may have to change some people," added Haug.

He is definitely not referring to Nico Rosberg, Mercedes' most consistently competitive driver this season, or seven time world champion Michael Schumacher, who is firmly under contract for 2011 and keen to win an eighth title.

But former GP winner Gerhard Berger admits he has been increasingly disappointed with the 41-year-old German over the last few races.

"He has been taking more steps back than forward," the Austrian is quoted by Auto Motor und Sport.

"He has tried several strange tricks to gain points, and they have all come to nothing. Maybe he is putting himself under too much pressure," added Berger.