Laurent will join Dwight Merriman and Ryan Dalziel aboard IDEC's #17 Oreca 07-Gibson as a last-minute replacement for Kyle Tilley, who sat out the official test day on Sunday.
It follows American-based Briton Tilley withdrawing from planned appearances in both the NASCAR Cup and Xfinity events that took place last weekend on the Indianapolis road course.
Laurent is now set for his fifth start at Le Mans, having been part of the Jackie Chan DC Racing line-up that finished second overall and first in the LMP2 class in 2017 before stepping up to join Rebellion in the top LMP1 division for the 2018 and '19 races, taking another podium.
The Frenchman returned to the LMP2 ranks last year as he joined the Signatech Alpine effort for the 2020 FIA World Endurance Championship campaign, but was left on the sidelines for 2021 as Alpine stepped up to the top class with its grandfathered Oreca LMP1 (previously the Rebellion R-13).
Indeed, this weekend's race will mark Laurent's first competitive outing of the year as he was left without a drive in either the WEC or the European Le Mans Series after being dropped by Alpine.
IDEC Sport's #48 car will be driven by Paul Lafargue, Paul-Loup Chatin and Patrick Pilet.
Chatin set the pace in the LMP2 class during the test day with a best time of 3m31.105s, narrowly eclipsing the Panis Racing Oreca of Will Stevens that was second-fastest.