Cosworth Yamaha team boss Steve Dixon is to have an emergency operation on his spine after slipping three discs at the German GP.
Dixon was unable to move his legs so was rushed into the local hospital direct from the paddock.
He is to go under the knife on Sunday morning. Doctors said unless they operate straight away he may not be able to walk again.
He is set to be kept in Germany for at least 10 days after the operation.