Former Formula 1 racer Derek Warwick has criticised world champion Lewis Hamilton for opting out of the two-day test event in Austria this week.

Hamilton declined the opportunity to test new parts on his Mercedes car in Spielberg, which gave his teammate, and world championship rival, Nico Rosberg more time to get familiar with the upgrades.

Warwick told The F1 Show: "[Hamilton] was off the pace all weekend in Austria, he had a bad start. I'd want to be trying that start out again, checking my clutch is ready for the British Grand Prix.

"I just find it bizarre that he would say 'no' and go off and be in Monaco with whoever he was with. As a racing driver you want every second you can in the car, if anything to keep the other driver out. It is obvious to me."

Hamilton leads the championship by 10 points from Rosberg.