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Lewis Hamilton has insisted that Mercedes still have plenty of room for improvement in spite of Carlos Sainz's assertion that the Silver Arrows have been hiding their true pace at this week's pre-season test in Bahrain. Mercedes have been widely tipped to lead the fight for Constructors' Championship glory once again this year after turning plenty of heads with their heavily upgraded car that was unveiled at the start of Thursday's morning session.

The sidepods of the Mercedes W13 are now virtually non-existent in an unprecedented innovation that has raised no shortage of eyebrows across the paddock.

However, it remains to be seen whether the German team will be in the ascendancy when the competitive action gets underway at next week's Bahrain Grand Prix.

George Russell has already suggested on a number of