Iker Casillas returned to Porto's pre-season training on Monday two months on from being hospitalised after a heart attack.
Porto posted photos of the players returning for pre-season preparations on their official website, with Casillas among the squad.
The 38-year-old goalkeeper also posted a message on Twitter which read: "Back to work. First day."
Iker CasillasVuelta al trabajo. Primer día. ud83dude01 @FCPorto https://t.co/7NkmLRTfwz
The Real Madrid and Spain legend was hospitalised back in May and underwent emergency surgery after having a heart attack during training.
Upon being discharged, Casillas said he did "not know what the future will be," per BBC Sport.