The England star escaped suspension after cupping his hand in front of his crotch having scored against Slovakia.
Southgate will become just the third coach to reach a century of matches in charge when he faces Switzerland on Saturday.
Didier Deschamps men have yet to fire in the tournament but must now face a buoyant Portuguese side led by Cristiano Ronaldo
Bellingham’s post-Slovakia celebration earned him a suspended one-game ban from Uefa and Southgate has backed his young midfielder