Based on the cross-centred ecumenism of Moltmann, this article describes the problems of ecumenism among the churches of the global south. While acknowledging the paradigmatic shift in the centre of Christianity to these regions, it notes the problematic character of this shift for ecumenism especially in Africa. Situating Moltmann in discourse to the Johannine priestly prayer, it explicates some defining aspects of Moltmann’s cross-defined ecumenism for the African church. In this regard, the paper describes the problems as well as prospects that this christocentric mapping of Moltmann’s thought provides for the unity of the churches in Africa.