Other clubs have noted Mitrovic's failure to hold down a regular place and Rafa Benitez is preparing to field offers for him next month.
The manager will battle to keep him, but said:"Players have agents, so if they are not playing somebody will try to move them on because he thinks it will be fine - and there is commission in the middle. That is the problem with football now."
Will Newcastle take an offer? Probably, if it is in the region of £15m.
Rafa didn't sign the Serb, and he has often spoke of his concern about the player's aggresive attitude on the pitch.