The agent of Iker Casillas has alerted Premier League clubs that his client is open to a January switch, reports the Daily Mirror.
The 32-year-old has found himself behind Diego Lopez at Real Madrid for most of 2013 and has yet to play a minute of La Liga football this season.
Although still be used in cup competitions, Casillas is worried his place in Spain's World Cup squad is in doubt and is now prepared to leave the club he has spent his entire career with.
Both Arsenal and Manchester City have been notified by Casillas' agent that he will be happy to leave Real Madrid should an offer come in from another club with both Arsene Wenger and Manuel Pellegrini rumoured to be interested in the Spanish captain.
The Gunners are set to lose their second-choice goalkeeper Lukas Fabianski to Schalke 04 while Emiliano Viviano is only at the Emirates on loan.
Wenger knows goalkeeper reinforcements will be needed in the near future and is happy to sign Casillas as a number one despite the fine form of Wojciech Szczesny.
Manchester City's need for an established number one is seemingly more urgent that Arsenal's.
Joe Hart has lost his place to Costel Pantilimon following a string of errors but the tall Romanian is not deemed a long term solution.
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