Over the years, Nigeria has faced series of development challenges despite the fact that the governments have constantly accessed credit facilities for national development. This contradiction became a source of worry for scholars, journalists, and commentators who began to question the management of the countryâ€™s foreign debt. The debate became more critical and controversial when Nigeria in attempt to wriggle itself out of the foreign debt burden negotiated â€œDebt Reliefâ€ with the major external creditors. While some individuals share the view that the negotiated debt relief actually relieved Nigeria from its financial burden; others contended that the purported â€œDebt Reliefâ€ more or less worsened Nigeriaâ€™s indebtedness to the creditors because the conditions like previous ones associated with the debt management strategies were more exploitative than palliative. Although attempts have been made to examine the countryâ€™s debt management strategies by investigating the trends in Nigeriaâ€™s debt profile, adequate research-based attention has not been given to the extent which the â€œDebt Reliefâ€ is effective and sustainable. Consequently, this paper is tailored towards addressing the questions: How effective were the debt management strategies adopted by the Nigerian government in addressing debt crisis? Has the debt relief granted to Nigeria in 2006 actually relieved the country from the debt burden? How sustainable is the debt relief? This study is therefore meant to analyse Nigeriaâ€™s foreign debt management and the challenges of sustainability. In the light of the dependency theory and time-series analysis, it is argued that Nigeria only enjoyed temporary relief from the debt crisis because the management strategies adopted so far were not effective as to ensure sustainability.