The Frenchman last raced Milan-San Remo in 2013, finishing 17th in an edition of the spring Monument that was disrupted by heavy snowfall.
While Bardet is known primarily as a Grand Tour racer, having finished on the podium at the Tour de France in 2016 and 2017, his stand-out performances in 2018 came in one-day races.
He won the Classic de l'Ardèche at the start of the season, before finishing second at Strade Bianche, second at the Tour du Finistère, ninth at La Flèche Wallonne, and third at Liège-Bastogne-Liège. Later in the season he was runner-up at the Giro della Toscana before taking the silver medal at the World Championships road race in Innsbruck, missing out on the rainbow jersey in a sprint with Alejandro Valverde.
Bardet will line up at Paris-Nice between March 10-17, and at the Volta a Catalunya between March 25-31. He plans to slot Milan-San Remo into the middle but, with only a day separating it from the start of Catalunya, his team were keen to stress that it wasn't set in stone.
"It's Romain's choice that he wants to add Milan-San Remo to his initial programme, but nothing has been definitively decided. It will all depend how things go at Paris-Nice. AG2R La Mondiale directeur sportif Julien Jurdie told L'Equipe.
"He is excited by the idea of racing San Remo, he's a competitor at heart, but he also knows that it mustn't impact upon Catalunya, which is another important race for him."
Bardet will start his 2019 campaign at the three-stage Tour du Haut Var in France in late February, before racing the Ardèche and Drôme Classics ahead of Paris-Nice in what is an all-French start to the season. After Catalunya he will return to Liège-Bastogne-Liège but will then take a break in order to build towards the Tour de France via the Critérium du Dauphiné in June.