'One of the greats': Messages pour in for Porto goalkeeper Iker Casillas after shock heart attack

Messages have flooded in on social media following the news that Spanish World Cup-winning goalkeeper Iker Casillas had suffered a heart attack after training at his club, FC Porto, on Wednesday.

A host of players and clubs have taken to social media to convey their messages of support for the former Spanish international keeper, who captained Spain to victory in the 2010 World Cup in South Africa.

His former teammate at Real Madrid Gareth Bale led the well-wishes on Twitter, posting: "Get well soon my friend @IkerCasillas," while Leicester City keeper Kasper Schmeichel revealed he was "Shocked reading the reports. Hope you are ok my friend @IkerCasillas."

Premier League giants Chelsea tweeted their support, saying: "Get well soon, @IkerCasillas. All of us at Chelsea wish you a full and speedy recovery," while Serie A side AS Roma and Bundesliga club Borussia Dortmund expressed similar sentiments.

Former Liverpool keepers Simon Mignolet and Loris Karius wished Casillas well, with Mignolet hailing Casillas as "One of the greats," urging him to "Stay strong," and Karius sending his best wishes after being "Shocked about the news."

Former England captain Gary Lineker tweeted: "Sorry to hear this. Wishing @IkerCasillas a full and speedy recovery. One of the greats."

And the official Twitter account of the FIFA World Cup posted a heartfelt: "Wishing you a speedy recovery, champion. Get well soon."