The goalkeeper's future in Spain is looking increasingly uncertain as Real remain heavily linked with Manchester United's David De Gea.
The long-serving goalkeeper has come under increased pressure in recent seasons after a number of high-profile errors, although he still remains number one for both Madrid and Spain.
However, his position at the Santiago Bernabeu is looking increasingly uncertain with the club continually being linked to Manchester United keeper David de Gea – with the Express suggesting that Los Blancos are ready to open the bidding.
And while Casillas would prefer to stay in Spain with Madrid – as per the Manchester Evening News - should he be forced to leave, it seems London would be his ideal destination, according to AS. That will likely put Premier League duo Arsenal and Tottenham Hotspur on red alert – with both linked with an approach by the Express and Independent.
It is believed that Spurs in particular could lose number one Hugo Lloris, with Manchester United thought to be keen if they lose De Gea to Madrid, according to the Daily Star. That would mean Mauricio Pochettino would need to replace his number one, and Casillas could be the answer.
Contrastingly, Arsenal are still said to be looking for a first choice goalkeeper, with both David Ospina and Wojciech Szczesny looking unlikely to be long-term solutions. They have been liked with Casillas for a number of years now and could be a more attractive option given they can offer him Champions League football.
Nothing is certain as yet, although it does seem that any potential move for De Gea could spark a transfer merry-go-round of goalkeepers this summer.