Real Madrid's coach Carlo Ancelotti isn't too keen on Fabio Coentrao and with Marcelo not getting any younger he is looking for a player to be the long term replacement for Marcelo, with Coentro having already found himself standing at the exit door.
The two clubs have good relationships though and Real Madrid wouldn't force the issue, but they do have a ton of money and could either reach Gaya buyout clause or big cash offer and of course which player wouldn't want to play for such a big club, so they do have that on their side as well, as they are able to persuade most players to join them.