This paper examined the attempt made by ECOWAS member states concerning the adoption of ECO Currency and identified the challenges militating against the monetary policy vis-à-vis the laid down criteria. Group Theory was adopted for this study. Also, secondary method of data collection was adopted for the study. The findings revealed that the inability to fulfil the macro-economic
convergence criteria is the bane of adopting the ECO Currency, coupled with the trust deficit syndrome in relation to the disunity amongst member states; over the subject matter. The study concluded that the interest shown by President Emmanuel Macron of France appears to be partially responsible for the trust deficit vis-à-vis the disunity in adopting the ECO Currency. Consequently, this study recommended that there should be transparency amongst ECOWAS member states in order to come to terms with operating a unified monetary policy that would subsequently lead to the implementation of Eco-currency. Besides, member states should look inward in order to guarantee economic development and enhance financial benefits for residents within the sub-region.