Buhari dropped the hint in one of the interviews he granted one of the foreign media in his hotel shortly before departing New York.
The President was in New York to participate in the 70th United Nations General Assembly.
“I will serve as the Minister of Petroleum Resources myself,” Buhari told his interviewer.
The nation’s petroleum sector has been said to be enmeshed in corruption with millions of dollars said to be missing in the Nigerian National Petroleum Corporation.
Shortly after assuming office, Buhari sacked and replaced the management of the company.
The new management had started a general reorganisation of the firm.
Buhari had on Monday said the trial of those who looted the NNPC would commence soon.