Infiniti Red Bull Racing has announced that it has once again signed Sebastien Buemi as its Reserve Driver for 2015. He takes on the role having recently been crowned World Endurance Championship title winner, alongside team-mate Anthony Davidson.

The Swiss driver brings a wealth of racing experience to the team indeed, this will be his fifth year as reserve driver at Red Bull. His first stint as the team's test driver came in 2008, when he was rising through the junior ranks in preparation for a Formula One career.

After three seasons of racing in F1 for sister team Toro Rosso, during which he contested 55 grands prix, Sebastien returned to Red Bull as reserve driver in 2012.

He has since mixed the role with racing in other series and as well as a highly successful sports car career, he is also a regular Formula E racer. He most recently won the series' event in Punta del Este, Uruguay.

"We are delighted that Sebastien will once again act as our reserve driver," said Christian Horner. 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."

"I'm very pleased to take on another season as reserve driver at Red Bull," added Buemi. "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."