Valtteri Bottas is set to start Sunday's Italian Grand Prix from the back of the grid after Mercedes opted for a strategic engine change. Mercedes were weighing up whether or not to introduce a fourth engine for the 2021 campaign with nine rounds of the season remaining. Deciding not to do so would save on an engine penalty, but increased the risk of a potentially even more costly engine failure using an old power unit. And for Bottas, Mercedes have decided that the Italian Grand Prix at Monza is the right time for a new power unit, providing him with his fourth new engine of the 2021 campaign. That being said, the decision was ultimately made due to a 'little bit of a worry' for the team....
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