Mercedes boss Toto Wolff has said it is not a guarantee that Lewis Hamilton will use a fourth power unit this season.

Each driver is limited to using three engines across a season, and when extra elements or complete power units are used beyond the permitted amounts, grid penalties are handed out.

This is the fate which met Hamilton’s team-mate Valtteri Bottas at Monza, with the Finn taking a fourth engine of the season, and so dropped to the back of the grid for the Italian Grand Prix.

Hamilton only has two working engines remaining at his disposal, so Mercedes are mulling over the introduction of a new one, plotting out strategically when would be the best round to do that and take the penalty.

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