Last updated on .From the section European Football

Casillas posted this picture of him (left) arriving at Porto's training ground

Porto goalkeeper Iker Casillas reported for pre-season duty on Monday, two months after having a heart attack.

The former Real Madrid captain, 38, suffered "an acute myocardial infarction" during training in May.

Casillas posted a tweet external-link with a picture of him arriving at Porto's training ground with the caption: "Back to work. Day one."

The Spain legend made 31 league appearances last season as Porto finished second in the league.

Casillas spent five days in hospital after having the heart attack before he was discharged and said at the time he did "not know what the future will be".

He added the plan was to rest for "for a couple of weeks or a couple of months".

Casillas made 725 appearances for Real during a 16-year career at Bernabeu Stadium, helping them win three Champions Leagues and five La Liga titles.

He was also part of the Spain squad that won successive European Championships, in 2008 and 2012, and the World Cup in 2010.

Casillas joined Porto in 2015 and holds the record for the most Champions League appearances with 177.