Red Bull has announced that Sebastien Buemi has been retained as the team's reserve F1 driver for the 2015 season.

Buemi was first signed as a Red Bull test driver in 2008 before stepping up to race for Toro Rosso. However, he has been reserve driver for Red Bull since 2012 having been dropped from a race seat, combining duties with endurance racing.

Having won the World Endurance Championship (WEC) title this season alongside Anthony Davidson, Buemi has now been confirmed as Red Bull's reserve driver for another season and he said he's "delighted" to be continuing in the role.

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"I'm very pleased to take on another season as Reserve Driver at Infiniti Red Bull Racing," Buemi said. "It is like being part of the family now and I have a good working and personal relationship with everyone at the team. I'm looking forward to helping with the development of the RB11 in any way I can. It should be an exciting season and I'm delighted that I will be a part of it."

Red Bull team principal Christian Horner said the fact that Buemi won the WEC drivers' title this year shows how important an asset he is for the team.

"We are delighted that S?bastien will once again act as our Reserve Driver," Horner said. "He's been closely associated with the team for some years now, we value his skills very highly and we have a great working relationship with him. His experience has proved invaluable over the years and it is great to have another world champion at the team."