At Le Mans, the Queenslander will line up with a full-season driver from each of the IMSA entries in the #93 911 RSR.
Campbell won Le Mans in the GTE-Am class in the Dempsey-Proton Racing Porsche in 2018 and was fourth with the same team last year, while Bamber is a two-time outright winner in the 919 LMP1, including with Tandy in 2015.
Car #91 will be driven at Le Mans by Gianmaria Bruni, Richard Lietz, and Frédéric Makowiecki, while Kévin Estre, Michael Christensen, and Laurens Vanthoor are set to share Car #92.
Campbell, Pilet, and Jaminet were the highest finishing Porsche drivers in the Bathurst 12 Hour earlier this month when they finished fourth in an Absolute Racing 911 GT3 R.
The pre-Le Mans test day takes place on Sunday, May 31 (local time) before practice begins on June 10.