Remaining with TDS for the 2010 season, Thiriet finished second in the standings behind teammate Nick Catsburg with two race wins.

Thiriet followed TDS into sportscar racing in 2011, contesting the Le Mans Series in the LMP2 class in an Oreca 03 shared with Mathias Beche and Jody Firth.

The trio won the rounds at Spa and Estoril and finished fourth in the final drivers' standings.

Thiriet also contested the 2011 24 Hours of Le Mans in a Luxury Racing Ferrari 430, but the car failed to finish.

For the 2012 24 Hours of Le Mans they were joined by Christophe Tinseau and the car finished eighth overall and second in LMP2.