It's a question of sell or heal here, If the player is young then you should heal him, but if he is old (26+) then I would sell with him dropping down to 4* next season.
23 years old, but in any case I will buy in the next season to force a player with 5 * skill with 109 ...... heal him only if I have the need ... are five points ahead of the second if the league is the risk I take care of anything else