Casillas recovering after heart attack, says he's 'strong as ever'

Legendary Spanish goalkeeper Iker Casillas was taken to hospital after suffering a heart attack during FC Porto's training session on Wednesday.

The 37-year-old is in stable condition, and took to social media to update his status later in the day.

"Everything under control, a big fright but strong as ever. Huge thanks for all the messages and love," Casillas wrote on Twitter, as translated by Carmen Colino of Spanish outlet AS.

Casillas remains under observation at the CUF Porto Hospital.

Before moving to FC Porto in 2015, Casillas enjoyed a 16-year career at Real Madrid where he helped the club win five La Liga titles, two Spanish Cups, and the Champions League on three occasions.

The Spanish giants also issued a statement in support of their longtime 'keeper:

"Real Madrid wants to transmit all their support to their beloved captain Casillas. Casillas has taught us throughout his professional career to overcome the most incredible challenges to enhance the glory of our club. 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.

"Real Madrid want to see their eternal captain recovered as soon as possible and send him all the courage of the world."

Along with his success at the club level, Casillas is one of the most decorated goalkeepers on the international stage after playing a pivotal role in helping Spain win the 2010 World Cup and European Championship titles in both 2008 and '12.