Marca says backed by the board, the Dutch coach knows that he can take whatever decisions he wants with the squad, moving on even heavyweights like Luis Suarez last season.
Now, two players he wants to sell are Umtiti and Braithwaite and the club are looking desperately for a destination for them.
Their exits won't resolve the club's financial troubles, but will help to improve the situation.
Offers have been made for both players, but neither is in a rush to move on and they have not been convinced by the proposals.
On the pitch, Koeman is in charge, though, and he left that abundantly clear against Stuttgart.
Neither player made it off the bench for even a minute of action in the friendly, when it is normal for all travelling players to at least get some game time.
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