value will drop about 10% when he turns 19. Some are more, some are less. I would train him to 1 skill point from the next star so he can be placed on the transfer list and then leave him there. Or sell him via auction on day 1 of the new season during the afternoon/evening (your time).

Here are picts of my squad on level 5 and the next day when they became level 6 so you can see the change in player values.

Click image for larger version. 

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ID:	8824Click image for larger version. 

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