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Toto Wolff has dismissed suggestions that Mercedes' updated car design for the upcoming Formula 1 season is against the rules. The Silver Arrows team boss believes F1 chiefs will "be okay" with the changes made to the W13, which turned up for the first day of testing on Thursday with sidepods that were virtually non-existent.

The shape of the car was certainly very different to the model which was first unveiled by the team last month, and which took part in the Barcelona shakedown.

Instead, the bodywork in Bahrain was extremely narrow, with a much different design compared to any other car currently on the grid.

It has been claimed that Red Bull boss Christian Horner was left unimpressed by the changes, and told Auto Motor und Sport that "some parts are not legal".

However, Red Bull released a