Diego Lopez has taken good care of the goal but is Casillas fine with it, taking into consideration that this is a World Cup year? Former Real Madrid coach Bernd Schuster told ESPN Iker should consider a transfer.
Despite Casilla's lack of play, Vicente del Bosque trusts him, and is quoted by Marca saying: "We should be kind, respectful and appreciative with him and with those competing with him."
It seems wild to even think of a move but if it were to happen, where should he go?
Wojciech Szczesny has played four of the five seasons he has been with Arsenal. The 23-year-old has battled with fellow countryman Lukasz Fabianski for the starting position.
Boss Arsene Wenger has had to struggle with the injuries that the keepers have sustained in the past couple of seasons.
The Gunners have not had continuity in goal and this is where Casillas can come in handy. The fans are not happy with the Polish goalkeepers, especially with Szczesny. His performance against Aston Villa was far from impressive; he conceded three goals in Arsenal's opening fixture.
According to Metro, the Gunners have already contacted Real Madrid and are hoping to lure the Spaniard.
Casillas would have to fight for the starting position with David de Gea, who has left behind his shaky performances and has given Manchester United security.
In January, The Independent suggested that Casillas was of interest to Sir Alex Ferguson. It is a long shot, but if you consider that De Gea is on Barcelona's radar then the idea doesn't seem that crazy.
Spanish website Mundo Deportivo understands that David Moyes has doubts about De Gea, but the "Blaugranas" are ready to take him under their wing as the perfect replacement for Victor Valdes.
Therefore, Casillas is the prime choice for Manchester United, according to the Express.
Just behind Arsenal sit French heavyweights PSG. The Ligue 1 champions have put Nicolas Douchez in goal instead of Salvatore Sirigu, who was the undisputed starter for two seasons.
Douchez has conceded three goals so far; his team have two draws and one win in the local league.
Casillas can surely be a better option. He has far more experience than Sirigu and Douchez and would be an undisputed starter.
The Daily Star suggests that PSG are following in Arsenal’s steps and keeping close tabs on the Spaniard.
If Casillas leaves Real Madrid, he will not go to a club that does not play in the Champions League. Manchester United and PSG have guaranteed their place in this year's edition; Arsenal are close, having defeated Fenerbahce 3-0, in Istanbul.
Going to Manchester United does not mean he will automatically get the starting position. The De Gea situation can hold him back.
If he were to sign for PSG, he would definitively be Laurent Blanc’s first choice and he could play the Champions League and have a real chance to get the league title, as well.
Having said that, Arsenal seem to be his best choice. Although, he has to consider that it might be tougher to grab the Premier League title; the last time the Gunners won was in the 2003/04 season.
The transfer window closes next week (September 2) and one thing is certain: if Casillas announces his decision to leave Real Madrid, there will be a lot more than three contenders.