Jul.28 (GMM) Retired formula one champion Michael Schumacher has continued his recent run of close calls at the wheel of high speed vehicles.

Following several falls as he enjoys semi-amateur motorcycle riding, it is now being reported that the 39-year-old German crashed a Ferrari road car last week while testing at the notorious Nordschleife circuit at the Nurburgring.

Last Tuesday, Schumacher was not injured when his prototype 430 Scuderia struck a guardrail and was written off, Bild newspaper said.

It is suggested that Ferrari was using the partially-damp circuit exclusively, when its former five-time world champion went off at more than 250kmh.

"Michael called me and said 'We have crashed the car but are going to continue with another one'", Schumacher's spokeswoman Sabine Kehm confirmed.

However, she dismissed rumours that Schumacher's 9-year-old son Mick was also on board at the time of the crash.