Britain's Lewis Hamilton will sit out the final day of pre-season F1 testing in Barcelona.

An electrical fault with the Mercedes car meant he decided not to take to the track - letting new team-mate Valtteri Bottas have a go instead.

"Electrical fault kept us in the garage this morning, so I've decided with the team not to drive today as I wouldn't have learned much," he tweeted on Thursday.

"Shame not to drive but it's been a great few days. The guys have done an awesome job. Can't wait to be back in the car next week!"

Bottas has set the fastest time of the week so far.

Electrical fault kept us in the garage this morning, so I've decided with the team not to drive today as I wouldn't have learned much (1/2) pic.twitter.com/LS0Tr8aWdK

— Lewis Hamilton (@LewisHamilton) March 2, 2017

Shame not to drive but it's been a great few days. The guys have done an awesome job. Can't wait to be back in the car next week! (2/2)

— Lewis Hamilton (@LewisHamilton) March 2, 2017