Lewis Hamilton to start the Italian GP from the back of the grid after an engine penalty

Lewis Hamilton will start this weekend’s Italian Grand Prix from the back of the grid after Mercedes confirmed his car will be fitted with a new power unit which will carry a grid penalty.

Hamilton will use his fourth power unit of the season in Italy, bringing him over his quota for several engine parts this year.

Mercedes was forced to get the new power unit as it was still assessing which components from the engine it used at Spa-Francorchamps, its third power unit, could be salvaged following its retirement from that race.

Hamilton’s third power unit was damaged at the Belgian Grand Prix after his car was lifted into the air following a collision with Fernando Alonso.

“We will be fitting PU No. 4 this weekend for Lewis,” said a Mercedes spokesman. “This is because although we are still working on the recovery plan for the PU No. 3 that was damaged at Spa, that unit cannot run this weekend.

“It will come with associated grid penalties because it is over the allocation for the season.”

Teams are limited in the number of power unit parts they can use per car for cost-saving reasons.