If it is a GK, then it's "okey". Otherwise try to swap place/position and see if he gets better. Selling him would be suicidal.
Next time buy a scout that is 22-23 yr old and end with a -4 (Q54) or -9 (Q59). That way he will reach 7* (stars) much easier and you will have him as a scout on next lvl/season as well. The one you bought (Q52) is mediocre and probably slow trainer.