Mercedes release reserve driver Nick Heidfeld from his contract to become Pirelli's tyre test driver.

Pirelli has begun its first tyre development test as it prepares for its return to Formula One for the first time in 20 years.

Nick Heidfeld was announced as Pirelli's official test driver on Tuesday as the Italian tyre manufacturer prepares for its return to Formula 1 for the first time in 20 years. The experience F1 driver is looking forward to get back on track again and work on the development of the new Pirelli Pzero F1 tyre.

Following the return of racing to Donington Park the circuit is now set to move forward in the next stage of its development.

Mercedes has confirmed that Nick Heidfeld has been released from his contract as the team's reserve driver in order to take up the position of official test driver for Pirelli.

Nick Heidfeld will join the Pirelli development team in order to prepare the Formula 1 tyres for next season. Mercedes Grand Prix confirmed on Tuesday morning the team's test and reserve driver was released from his contract to take up the position of official test driver for Pirelli.

Jorge Lorenzo was the fastest rider in Monday's day of testing. The day ended early though as heavy rain came down in the afternoon. At Brno Casey Stoner ended second, with Honda rider Dani Pedrosa in third.

Valentino Rossi moves closer to F1 switch, plus other news