Sebastian Vettel illness rules him out of testing day one!

Sebastian Vettel was supposed to be in the car on the first day of testing, but if you've been paying attention you'll notice that it's actually Charles Leclerc in the Ferrari. This is because Vettel has picked up an illness, ruling him out of Wednesday's running.

Ferrari revealed on Twitter than their German driver is "not feeling great" and that Leclerc would be switching days, jumping in the car for day one rather than day three.

Vettel and Leclerc are said to be on an equal standing at the team this season, free to race despite a few run-ins last season. Their relationship looked at breaking point after a clash in the recent Brazilian Grand Prix that forced them both out of the race, but they seem to have patched up their friendship and it's set to be an exciting year to see which of the Ferrari men can come out on top.