Austin: Sebastian Vettel feels it will be "a shame" if he is unable to run in qualifying ahead of Sunday's United States Grand Prix but admits his hands are tied by the regulations.


Sebastian Vettel 

It appears almost certain Red Bull will have to change the complete power unit on Vettel's car, which would incur a pit-lane start. Vettel, in particular, has suffered numerous technical issues this season in comparison to teammate Daniel Ricciardo, and now the four-times champion is poised to take one more blow.