With Real Madrid already 16 points behind a rampant Barcelona side, club president Florentino Perez will make a decision on the future of the Portugeuse coach at the end of the season, and if he stays, Iker Casillas could be forced out.
Madrid based Spanish newspaper Marca are reporting that Arsenal boss Arsene Wenger has grown tired of current number one Wojciech Szczesny, as the boss looks for a more experienced keeper to marshall his back four.
A move for Casillas is possible for Arsenal, with Real Madrid being linked for Chelsea star Petr Cech and Manchester United stopper David de Gea in recent times.
Mourinho was unfazed by Adan's early red card against Sociedad, and is certain his plan will work despite the majority, if not all Madridista's showing their unhappiness on Sunday.
Signing Iker Casillas will be a huge statement for Arsene Wenger's side, who have also been linked with Barcelona star David Villa.