Only topscorer Andre-Pierre Gignac has netted more goals for Marseille than 21-year-old Thauvin this season.
Thauvin has scored five goals in 17 league matches. He has also hit five in four appearances for France at Under-21 level.
Belgium-born Imbula, also 21, is a more defensive-minded player, but has still managed to net once in 18 Ligue 1 outings this term.
Neither player was on top form in front of Hillion though, as Monaco recorded a 2-0 win at Stade Louis II.