The striker has undergone a medical with Martin Jol's side and will depart Old Trafford before the deadline but there could be yet another twist regarding his future after he had initially seemed set to join Fiorentina or Juventus.
"Dimitar was always going to be going," admitted the boss. "I said last year he'd be leaving at the end of the season. He's not gone yet, though. I don't know anything about it.
"There has not been any contact from him. We thought he was in Italy, but it turned out he isn't. He could be anywhere. I really mean that.
"I wouldn't be surprised if he's at Tottenham. There are rumours going around. I do not think it's settled at Fulham, put it that way.
"He's a very talented player and his contribution is good, particularly in home games. He's the only player to score a hat-trick against Liverpool for United [in a very long time].
"When we changed our game, it didn't suit him. We started to play with more speed and teams were getting organised very quickly against us. Therefore, we had to change the way we wanted to play and it didn't suit Dimitar but he's a very talented player. Wherever he goes, he'll do well."
There is unlikely to be any other activity around Old Trafford before the deadline on Friday night although a couple of loan exits are still in the pipeline for next week.
"There will not be any more business today," stressed Sir Alex. "There's no need to loan today. We can do that seven days after the deadline.