Celtic gained revenge for their Champions League exit to Cluj as Neil Lennon's side got their Europa League campaign up and running with a 2-0 win over the same opponents.
Romanian champions Cluj knocked their Scottish counterparts out in Champions League qualification, with a remarkable 4-3 victory at Celtic Park seeing them progress 5-4 on aggregate.
Cluj met their match in the form of Slavia Prague in the final play-off round, dropping into Europa League Group E, winning their opening fixture against Lazio.
Their return to Glasgow was not so triumphant, however, as Odsonne Edouard and Mohamed Elyounoussi sent Celtic to the top of the group.