The pair complete a top-notch driver squad for 2014.
Neel Jani took to the wheel of the Porsche LMP1 for the very first time.
Andrea Belicchi was forced to stay in a Le Mans hospital for three days due to sustaining a cracked a rib after an incident sent him head-on into the barriers.
Mark Webber's contract includes the World Endurance Championship in the Porsche LM P1.
The test day was of paramount importance ahead of the race in two weeks.
The race ended in an Audi one, two, three and a Ferrari double in LM GTE as the Italian cars triumphed in both Pro and Am.
The Swiss team has submitted entry applications for the FIA World Endurance Championship, the 24 Hours of Le Mans and the American Le Mans Series.
Prost had a hugely successful 2012 season with Rebellion Racing.