Very much doubt Barca or Real will pay £51m. They usually spend the big money on attackers. Anyway Laporte is good, but he is not £51m good. The guy would be worlds most expensive defender.
Barcelona are not looking for a left sided central defender, they have one for the foreseeable future in Umtiti. With Marlon Santos also on board, they will not splash the cash on an expensive CB since they never have done this before
I think it's very clear Laporte is still the target and based on the player's comments, just a matter of time