Porto announced on Friday they had signed Argentina goalkeeper Agustin Marchesin as a replacement for Iker Casillas, who has joined the club’s coaching staff following a heart attack.

Marchesin, 31, has agreed a four-year deal at the Estadio do Dragao after completing a reported 7.2 million euro ($7.9 million) move from Mexico’s Club America.

Casillas, a former Real Madrid and Spain captain, underwent emergency surgery on May 1 after suffering a cardiac arrest during training and has taken a spell away from playing as he recovers from the scare.