Barcelona's interest shows his potential, right? I think Chelsea can recover if they can handle their current issues, especially maximizing Enzo's potential. For now, patience and support are key
This causes some trouble with the player and the team, and the team punishes him, not play him, even give him fine and not pay a weeks worth salary or something, but eventually the team has to realize that they can't force a player to play, so if the player goes public, then he will get offers and when Chelsea realizes they can't get something out of him, they will just end up cashing him out. He was paid a lot, way too much, and expectations from him is too high, more than what he could provide for the team.
If Chelsea wanted to sell him today, there are really not many things that Enzo can do, well he has to agree to go to other team as well, but Chelsea would have shown the world his value, at that point he is the unwanted man in a team he is forced to stay, if you are getting paid 15 million a year, and Chelsea agrees to sell you to a team that offers 8 million a year to you, why should you leave 7 million a year on the table? Eden Hazard literally retired that way, by just collecting cash every month from Madrid without even playing there for many years.