If a popular player is transferred to another club it might be quite sad, both for the fans and the club, because after all popular players are like a magnet in the club and they are able to increase the exposure and performance of the club. However, we cannot expect that a player will stay in the club forever, surely sooner or later the player will choose to move clubs for whatever reason, and as fans we must be able to move on and continue to support the club - even though there are times when we miss popular players, let it be a memory, and remember there are other things we can enjoy from our club besides that popular players.
It is common for popular players to move clubs and it happens almost everywhere in football and it is very rare for a player to only stay at one club until he decides to retire. The hatred of fans towards players who have given success to the club is real and even when the new club is going to face his old club, some fans do not stop mocking the player.
Fans must forget the players who have left and it is impossible for them to stay at one club until they retire. The club means more than a player so the departure of a mega star will not affect the club.