FILE PHOTO: Soccer Football - Champions League Quarter Final First Leg - Liverpool v FC Porto - Anfield, Liverpool, Britain - April 9, 2019 FC Porto's Iker Casillas during the warm up before the match Action Images via Reuters/Carl Recine/File Photo
MADRID (Reuters) - Spain's World Cup winning captain Iker Casillas, 37, suffered a heart attack while training with his Portuguese club Porto on Wednesday, but later tweeted from hospital to say he was "feeling strong".
Casillas played 167 times for Spain and famously captained them to their first ever World Cup win in 2010.
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