Congolese side TP Mazembe earned a narrow first-leg advantage in the Confederation Cup semis after beating Moroccan side FUS Rabat 1-0 on Sunday.
Striker Ben Malango scored the only goal of the game after 14 minutes.
Despite having an early lead, the defending champions wasted many goal-scoring opportunities to head to the Moroccan capital with an uncomfortable lead.
In the other semi-final first-leg clash, Supersport striker Thabo Mnyamane converted a late penalty to rescue the South African side from a stunning defeat at home to Tunisian outfit Club Africain.
Veteran striker Saber Khalifa put the visitors in front in the 15th minutes from the spot after defender Morgan Gould handled in the area.
But Mnyamne kept his side's hopes alive in Africa's secondary club competition, netting a late equaliser.