Agu was at a time the Assistant Legal Adviser/Company Secretary in Unity Life and Fire Insurance Company Limited from where he joined the top Nigerian Solicitors firm of Irving and Bonnar in 1990. While in Irving and Bonnar between 1990 and 1996, he worked directly on various matters relating to lending and security documentation, and also was extensively involved in the capital market department. These matters in the main involved the International Finance Corporation (IFC) and other regional finance organisations such as the African Development Bank (ADB). Amongst the IFC projects were the Africa Enterprises Fund projects such as Agro-Technical Services Ltd., Canplas Ltd., Vicoda Ltd.; to much larger composite lendings such as Afprint Ltd., General Cotton Mill Ltd., First Securities Discount House Ltd., Abuja International Diagnostic Centre Ltd. and Tourist Company of Nigeria Ltd. With regard to purely capital market matters, he was directly involved in the TCPC managed divestment of Federal Government of Nigeria shares in First Bank of Nigeria Plc. as well as Tourist Company of Nigeria Ltd, former owners of Federal Palace Hotel. He was also involved in numerous public and private issues of several blue chip companies such as PZ Industries Plc. and John Holt Industries Plc. He is a member of the Nigerian Insurance Law Association (NILA) as well as the International Bar Association. He is a Director and co-ordinator, sports and Entertainment Law Association (Ltd/Gte).