Fletcher has stepped up from his U18 role after Monday's dismissal of Ruben Amorim.
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Asked if there's been any contact or congratulations from Ratcliffe, Fletcher told The Sun: “I have not, no. I speak to Omar (Berrada, chief exec) and Jason (Wilcox, sporting director).
“For me, I have been focusing on the job in hand. No thoughts or conversations on my future.
“They have given me full responsibility to take control for these two games.”
He added: “I’ve had responsibility for my own decisions, to lead the team and prepare the team, that is what I have been doing.
“There have been no conversations with anybody outside of those two people in higher-up positions in the club.”
United meet Brighton in the FA Cup third round this weekend.