Lewis Hamilton has been given the all-clear to race with his new-spec engine in Sunday’s Italian Grand Prix after Mercedes diagnosed the cause of Nico Rosberg’s power-unit failure.

– Italian GP: Lewis Hamilton takes pole in Monza
– VIDEO: Massa & Bottas on why they love Monza
– F1: McLaren intends to keep Button – Boullier
– Tyres: Hamilton warns of Pirelli ‘disaster’ in Italy

Rosberg has been forced to revert to the engine which he used at the last race in Spa after reporting a problem in final practice. And there were concerns that Hamilton, who starts from pole in Monza, would have to follow suit.

But an investigation conducted by Mercedes has determined that Rosberg had a leak in his engine’s cooling system, and as such, Hamilton’s engine will not have to be replaced ahead of Sunday’s race. 

Speaking after qualifying, Rosberg, who starts only fourth, says his race will be now severely hampered. Rosberg is expected to be down on power in relation to his team-mate.

The German, who is already 28 points adritft of Hamilton in the championship, said: “The engine is six races old so it has done a lot of mileage and engines degrade over time.

“It has definitely compromised my weekend and my race as well. My laps felt good and you can see that I lost a lot of time on the straights, so that makes it difficult. ”It’s not great because I need to start closing the gap in terms of points.”