The Spanish football goalkeeper who plays for the Spanish La Liga club Real Madrid and the Spanish national team, being the captain of both.
He could have moved to Arsenal this summer but former boss Jose Mourinho sabotaged the deal, according to reports.
Casillas broke into the Real Madrid side and won the Champions League as a teenager before going onto become club captain, while also leading Spain to its first World Cup title.
Real Madrid goalkeeper Iker Casillas is "enthusiastic" over an offer from Porto, according to his agent.
Iker Casillas breaks down in tears in emotional farewell.
A very emotional and teary Iker Casillas struggles to speak at a press conference after formally announcing his departure from Real Madrid.
A very emotional and teary Iker Casillas struggles to speak at a press conference after formally announcing his departure from Real Madrid. Tommy Lasorda. Real Madrid will present a Spain international goalkeeper to their supporters in the Santiago Bernabeu on Monday but it will not be David De Gea whose move to the Spanish club continues to stall.