"I saw the comments and I'll nip it in the bud," Coleman said after the 2-1 defeat at the Riverside.
"I understand that he's disappointed but he has a job to do at Fulham.
"He's a very, very important part of our team and, although it would be a dream for him to play at Manchester United, us selling a top striker who has 14 goals in January would be bad management by me and bad for the club to do that.
"What's happening at the moment is disruptive but we have to get on with it. I don't like making excuses and I'm not going to start now."