This isn’t true though is it.If he wants out of course then his value drops regardless. Two seasons of a goal every other game and your money back (including wages) isn’t to be sniffed at.
Just because a player would like to further their career at another club then it doesn’t follow that their fee reduces.
I dont doubt that Mbeumo wants to leave Brentford for United or Spurs but so far Brentford have turned down 3 bids of over £50m ….
6 weeks until the window shuts no player is getting their valuation discounted mid July unless it was not realistic in the first place or the club are in financial distress.