Manchester United's return to the Champions League pits the Reds in Group A, alongside Benfica, Basel and CSKA Moscow.
Jose Mourinho's men earned a place in the elite continental competition by winning the Europa League last term and will be eagerly awaiting special nights at Old Trafford and beyond.
Top seeds Benfica, the club's opponents 50 seasons ago in the European Cup final – one of nine competitive meetings between the teams – sold defender Victor Lindelof to United in the summer while another new boy, Nemanja Matic, also plied his trade for the Lisbon giants.