[2] Yusufu started work at the Katsina Native Authority serving as Assistant District Officer in Ilorin Province from 1949 to 1954.

In a letter to Yusufu in September 1994, the oil minister Don Etiebet said that the NLNG board had "seriously tinkered with the integrity of the pending contract award".

[3] During a probe into alleged bribes by KBR, a London-based consultant, Mr Jeffrey Tesler said he had advanced money to Muhammadu Dikko Yusufu in the form of a repayable loan.

[5] Attempts were made to implicate US Vice-President Dick Cheney in the corruption scandal, which involved over $180m of bribes on behalf of a consortium led by Halliburton.

Yusufu indicated interest to contest the Presidential elections under the Grassroots Democratic Movement in Nigeria during the period of transition to democracy launched by General Sani Abacha in 1997–1998.