Head of Audi's Le Mans prototypes Chris Reinke says the battle for Le Mans 24 Hour glory will be fiercer than ever with Nissan joining the LMP1 class for 2015.

Audi claimed Le Mans 24 Hour victory last year with its R18 e-tron Quattro but missed out on manufacturer's crown in the World Endurance Championship to Toyota.

Nissan unveiled its entry into WEC, which includes the prestigious Le Mans 24 Hour race, last week ahead of the entry list announcements. The number of manufacturers in the premier class has been boosted to four with Nissan joining Audi, Toyota and Porsche.

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Reinke believes a stronger grid is only a good thing for the sport.

"Audi has been making its mark as a pioneer of new technologies in motorsport for three decades. So, with that in mind, we're excited about meeting with a concept that's as individual as Nissan's," Reinke said. "It's clear that the battle for podium positions will even be fiercer this year.

"Even last year all three manufacturers were in contention for victory and obviously at Audi we're set on battling for our 14th Le Mans victory and would like to bring back the WEC title to Ingolstadt and Neckarsulm."

Looking ahead to the new season, Reinke confirmed Audi is hitting its early season targets and the drivers are preparing for endurance tests over the coming weeks.

"We're exactly on schedule as planned," he said. "The construction of the race car has been completed and testing started at the beginning of the year. Endurance testing will be the next thing on the agenda.

"Our drivers are intensively preparing in the simulator and in track tests with the new car. Our new signing Ren? Rast has already reeled off his first runs on the race track."

The WEC season starts with the 6 Hours of Silverstone race on the 12 April, with the Le Mans 24 Hour race scheduled for 13-14 June.