Tiago Monteiro will drive OAK Racing's Pescarolo-Judd LMP1 car at Le Mans in place of the injured Matthieu Lahaye.
Lahaye sustained back, hand and knee injuries in a qualifying crash in the Intercontinental Le Mans Cup/Le Mans Series event at Spa earlier this month, leaving a vacancy in OAK's Le Mans lineup alongside Guillaume Moreau and Pierre Ragues.
World Touring Car Championship front runner and former Champ Car and F1 driver Monteiro last contested Le Mans in 2009 with ORECA.
"As a driver and personality Matthieu is difficult to replace, but we see Tiago's arrival as a significant positive [as he] shares many of the same attributes," OAK's managing director Francois Sicard said. "Throughout his career, Tiago has always been as popular on the human side as he is sporting. He is a remarkable driver, fast, reliable and a very engaging person true to the spirit of endurance racing. This arrival offers a real boost to the team, which really needed one at this difficult time."