The Nigerian founder and group CEO of IT service management company Tingo Inc, the parent company of Tingo Mobile, was reported to be close to buying the club from Prince Abdullah.
Mmobuosi spoke about the issue with former Manchester United and England player Rio Ferdinand on his Five YouTube channel, but the EFL says it is awaiting responses to “several additional queries”.
An EFL statement said: “The EFL takes note of Dozy Mmobuosi’s comments regarding a proposed change of control at Sheffield United.
“While the league has received the stock purchase agreement and the proof statement from the owners and directors, along with some evidence of the source and adequacy of the funding, it previously raised a number of additional questions with the proposed purchaser and the club.
“The EFL has been awaiting a response to those inquiries for some time and until the league is satisfied that the requirements of its regulations have been met, it will not process a change of control at the club.”
United are bidding for promotion from the Sky Bet Championship, sitting second in the table, despite being placed under a transfer embargo by the EFL last month after failing to pay a payment to another club.
“Sheffield United were opportunistic, I felt the opportunity and I took it,” Mmobuosi said last week. “I felt the energy in the city and the history that the club has, it is obvious.
“I met with Prince Abdullah and we started talking. Unfortunately, I can’t say anything because I have agreed that there will be a joint statement when it is time. Fingers crossed when this deal is done, we’re going to make a comment.
“There is nothing to hide, we are ready to go through the process. I am not going to say yes, I am very sure that it will be done. I want to make the club a world class club with the help of all the professionals around me”.