Benoit Treluyer says this year's Le Mans 24 Hour could be the toughest he has ever faced as he prepares to secure a fourth victory at the prestigious endurance race.

The Audi Sport Team Joest driver bagged his third Le Mans victory 12 months ago in the R18 e-tron quattro alongside co-drivers Andre Lotterer and Marcel Fassler.

The #7 Audi LMP1 car has had a phenomenal start to the 2015 World Endurance Championship, taking victory at the opening two rounds in Silverstone and Spa.

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Despite Audi's early dominance in 2015, Treluyer feels this year will be a tricky race to predict and isn't ruling out any of his competitors from a potential Le Mans victory.

"With so many illustrious opponents the competition is the hardest it has been for some time now," Treluyer said. "I think the race is completely open. As always, its all about getting through quickly and reliably and without making any mistakes.

"I believe that well only really get an idea about who can win at the earliest at sunrise on Sunday. I've trained thoroughly for months and come well rested to the race. The week can now begin."

2015 marks the return of Japanese manufacturer Nissan to LMP1 competition and with 14 LMP1 entries it is anticipated to be one of the most hotly-contested races in the modern history of the blue riband event.