Martin Kohler and Sebastian Lander will be on the squad, while stagiaires Luke Davison and Loïc Vliegen will make their debuts for the WorldTour team.
The race tracks much of the course of the road race from the London 2012 Olympics. It starts in East London and ends in front of Buckingham Palace.
Gilbert, 32, has returned to his successful ways this season. He won the Brabantse Pijl and the Amstel Gold Race in the spring. In June he won two stages and the overall title at the Ster ZLM Toer. He has not ridden a grand tour in 2014.