Monaco: Champions League runners-up Liverpool, Ligue 1 champions Paris St Germain and Serie A side Napoli were thrown together in the pick of the groups following the draw for this season's Champions League made on Thursday.
The trio were drawn into Group C alongside Red Star Belgrade, European Cup winners in 1991 and making their debut in the group stage.
Titleholders Real Madrid will face last season's semi-finalists AS Roma plus CSKA Moscow and Viktoria Plzen in Group G.
Juventus forward Cristiano Ronaldo will face his former club Manchester United after they were drawn together in Group H that also includes Spanish side Valencia.
Inter Milan, back in the competition for the first time since 2011/12, face Barcelona, Tottenham Hotspur and PSV Eindhoven in Group B which features three former European champions.