After a 1-0 win over Tanzanian club Young Africans at the Adokiye Amiesimaka Stadium in Port Harcourt on Sunday, Rivers United advanced to the next round of the CAF Champions League.
On aggregate, the Port Harcourt Dwellers prevailed 2-0.
Uche Onwuasonaya, a substitute, scored the game-winning goal for Stanley Eguma's team nine minutes from time.
In the playoffs, Rivers United will meet either Ethiopian Faisal Kenema or Sudanese Al Hilal next month.
Bayelsa United also advanced to the next round of the CAF Confederation Cup after a 4-2 win over Guinea's Ashanti Golden Boys.
Favour Martins, Okardi Inikurogha, and Emo James scored in the first 35 minutes to give the Yenagoa club a 3-0 lead.
In the second half, Okardi scored the fourth goal for the Yenagoa team.
Moussa Keita scored a hat trick for the visitors.
In the following round, Bayelsa United will meet CS Sfaxien of Tunisia.