The 32-year-old continues to find himself marginalised at Real Madrid and could be ready to consider his future at the Bernabeu in January.
Casillas is currently behind Diego Lopez in the pecking order at Real Madrid.
Casillas could lose his place as Spain’s number one, should he continue to be sidelined at Real Madrid.
Both Arsenal and Manchester City are looking to bring in a new keeper and could make an attempt at signing Casillas in January.
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