"Real Madrid and its supporters wish to see their eternal captain recover as soon as possible and send him all the support of the world", the club said.
Reports in Portugal claim that Iker Casillas has been urgently hospitalised. The club announced that he's in stable condition at CUF Porto Hospital and that the problem is "solved".
During his club career he has won the Champions League three times - with Real in 2000, 2002 and 2014.
Real wished their former captain a full recovery.
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There was an outpouring of support towards the former Real Madrid and Spain captain on social media once the news broke of the incident on Wednesday afternoon.
"It has taught us that giving up does not fit into our philosophy of life and has shown us countless times that being stronger the harder the challenge is, the way to achieve victory".
The 37-year-old was also in goal for Spain when they won the 2010 World Cup, as well as their triumphs at Euro 2008 and 2012.
Porto are second in the Portuguese championship, just two points behind leaders Benfica, and face Sporting Lisbon in the Portuguese Cup final on May 25.
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He left Real in 2015 to join Porto, where he won the league title past year.
The 37-year-old underwent surgery, which nearly certainly will rule him out for Porto's final four games of the season and also might end his storied career.
Casillas joins a growing list of players who have suffered heart attacks. He holds the country's record for most worldwide apperances at 167.
He goalkeeper is married to the Spanish television journalist Sara Carbonero, with whom he has two children.
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