Iker Casillas is awaiting medical clearance before making a decision on his future, according to the goalkeeper's agent Carlo Cutropia.
He returned home five days later and is now on the mend, but Casillas remains unable to take part in training and is waiting on clearance from his doctors before returning to action.
"Casillas is still on medical leave and neither the club nor Iker are in a hurry to make a decision [about his future]," Cutropia told ESPN.
"No decision regarding his future will be made until Iker is given the all-clear by doctors."
The former Spain international has been the subject of retirement rumours since suffering his heart attack, and he moved to quieten such whispers himself shortly after the incident, writing on Twitter: “Retire? There’ll come a day when I have to retire.
“Let me announce that news when the moment comes.”
It was reported in the Portuguese media that Casillas has been offered a fee to terminate his contract a year early and join Porto's board of directors, but Cutropia insisted those rumours are wide of the mark.
"Reports in the media are not true," he added.
"Porto are treating Iker wonderfully."
The 38-year-old also tasted success on the international stage during Spain’s period of dominance 10 years ago, lifting the 2010 World Cup as well as two European Championships in 2008 and 2012.
He earned 167 caps for his country during a 16-year spell in the senior squad, making him Spain’s most capped player of all-time with former team-mate Sergio Ramos two caps behind him.
The stopper won the Primeira Liga with Porto in 2018 and made 31 appearances for the club in the league last season, keeping 18 clean sheets in total.