Madrid is thought to have offered Casillas to Arsenal in August but Arsene Wenger did not opt to swoop for the stopper, while Manchester City's Jesus Navas was hoping to pursued his countryman to join him in the Premier League, says the Daily Star.
Navas said at the time: "We all know the great keeper that Iker is and the importance he has within the team.
"At City we have great keepers, but Iker would be a great addition.”
And while no deal eventually emerged for the keeper, Casillas has now admitted he will consider quitting the La Liga giants in the January transfer window.
"As of now my decision is to stay and fight, to struggle and play every day. If I wasn’t sure about it I would have told the president I wanted to leave in September.
"That being said, if in three months things haven’t changed and you ask me the same question, well maybe I’ll be thinking about leaving."
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