May 8 (GMM) Nico Rosberg has begun working with a new manager.

Werner Heinz worked alongside Nick Heidfeld for much of the German's grand prix career.

According to Germany's Express, Heinz will now concentrate on commercial aspects for Mercedes race driver Rosberg.

The 24-year-old already has a personal cap sponsor -- the jewellery brand Thomas Sabo.

Rosberg, meanwhile, played down claims Mercedes got an unfair pre-race advantage by testing its updated W01 car at Rockingham last week.

"Oh, what?" said the German. "Those few laps on rock-hard tyres ..."

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