it depends on the player - if you are sure he will take a RS without informing dont do it
if you dont want him unless he will RS and if you have $$ to spend some extra effort on him, do it
if you have enough in reserve to get him back if he reacts badly to the inform, maybe
if he is a "reach" for your school in terms of prestige, may be a mistake to do it
if he is a top player at his position, probably wont take it even with extra effort
as with so much, it depends