Sebastian Vettel, Daniel Ricciardo, Carlos Sainz and Sergio Perez have all changed Formula 1 teams for 2021 and two-time world champion Fernando Alonso’s return to the grid completes an explosive set of big-name driver moves.
But after three days of testing in Bahrain, which of those drivers is ready to make an immediate impact? We dive into their respective pre-season programmes to establish who has the most work to do, and who looks like they’re ready to roll.







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