United's financial constraints could complicate any potential agreement despite their admiration for the player.
"I'm not sure Manchester United could be going to the daft sort of money levels, though, even though it's a player they absolutely have long admired.
And then you've got the wages to factor in as well," Mitten added.
Unforeseen developments during the transfer window could still alter Tchouameni's current situation in Spain.
"I stress, he's very happy at Madrid.
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But if a club don't want you and I've currently got no evidence that they don't want him, situations can change.
There are a lot of obstacles here as well," Mitten explained.
Manchester Evening News correspondent Steven Railston offered a more cautious assessment of the potential transfer based on club sources.
"Speaking to a United source across the weekend in Trondheim, they were adamant that a deal for Tchouameni is not currently realistic due to the cost involved," said Railston.
Financial valuations remain a primary hurdle for Manchester United in securing the midfielder.
"The internal feeling is that if Real Madrid were willing to sell the midfielder, he would not be available at a price United could meet," Railston stated.
United maintain interest in the player should Real Madrid alter their asking price.
"Tchouameni is a dream signing for United, and they would absolutely make an offer if they received the right signals from Madrid on price, but how much they would want remains to be seen, and whether they are willing to sell at all," Railston added.
