Casillas spent his second successive league game on the bench on Monday night.
The London Evening Standard reports that Arsenal could make a move for the goalkeeper as Casillas is considering a shock exit.
Casillas is currently behind Diego Lopez in the pecking order at the Bernabeu.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?