Mark Webber has completed his first test with Porsche after being given special dispensation to try out his 2014 car by Red Bull Racing.

The Australian will make the move into sportscars next year after retiring from F1 competition, having been named as one of the first four drivers for Porsche's return to the highest level of sportscars competition.

Webber hadn't been due to sample Porsche's hybrid LMP1 coupe until January, but was able to take part in the test at Portimao despite being under contract with Red Bull until the end of the year.

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It allowed the 37-year-old to make an early start on working with his new team ahead of its assault on the 2014 World Endurance Championship, which includes the Le Mans 24 Hours.

"My first day in this fascinating project was an intense experience for me," Webber said. "I would like to thank Red Bull Racing for giving me the chance to join the project so early.

"This is a major and important step for us all. It allows me to integrate with the team quicker and to contribute to further developing the LMP1 race car. We have a long way to go and it involves a lot of hard work. I have no misconceptions about this."

The test in Portugal was the latest session for the new Porsche, which has already appeared on track at Magny-Cours, Monza, Paul Ricard and Lausitz in recent months.

"I'm delighted to have Mark in the team so early," Head of Porsche LMP1 Fritz Enzinger said. "Red Bull Racing has helped us considerably in allowing this! Between the roll-out of the completely new car in June and now we have made significant progress. Every single kilometre was important, providing us with new data that brought the development forward.

"The whole team has worked extremely hard and I would like to express my sincere thanks for this. Our efforts will continue unabated in 2014. Until the start of the season at Silverstone mid-April there is still a lot to do."