Former F1 driver Marc Gene will not compete in the 2015 Le Mans 24 Hours after choosing to take on an advisory role for the returning Nissan team.

The Spaniard was Nissan's first signing for its burgeoning LMP1 project, which will see it tackle the Le Mans 24 Hours with its unusual front-wheel drive, front-engined GT-R LM car.

However, the car has endured a tough start to life, already missing the first two rounds of the World Endurance Championship in favour of focusing on Le Mans. Now, Gene - a former Le Mans winner with Peugeot and a podium sitter with Audi last year - has decided he won't race the car as planned, preferring to take on an advisory role instead.

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"It was a tough decision for me to take a step back for the Le Mans 24 Hours," said Gene. "I am so impressed with the efforts being made by the team and even though I won't race at Le Mans I will be there to help with my knowledge of the great race.

"Nissan is innovating in a big way with the GTR LM. Le Mans is going to be a huge challenge and I think that the best way for me to help the team is by taking on an advisory role. I am excited to see from the garage how the car will perform at Le Mans."

As a result, Nissan has amended its driver line-ups for Le Mans, with Alex Buncombe joining Harry Tincknell and Michael Krumm, while former GT Academy winner Mark Schulzitskiy will take the newly available spot in the third-entered car driven by Lucas Ordonez and Tsugio Matsuda.

Max Chilton, Jann Mardenborough and Olivier Pla will make up the lead Nissan, which will make its public debut at the Le Mans test day later this month having now completed its private testing in the United States.