Atletico Madrid have announced Angel Correa is to undergo surgery to correct a heart condition but that his transfer from San Lorenzo is still set to go ahead as planned.
The Spanish champions revealed last month that they had agreed a deal to sign the highly-rated 19-year-old forward on a five-year contract, subject to a medical.
That medical revealed a cardiac condition and, on the advice of specialists, the Argentine has decided to have an operation.
An official Atletico statement read: "Angel Correa will undergo microsurgery in the coming days to resolve a heart condition that was detected during the medical that he took in Madrid on May 28.
"The player has taken this decision after being advised by recognised experts in the field, with the coordination of the medical teams of Atletico Madrid and San Lorenzo.
"Those doctors predict a speedy recovery without any complications.''
Both Atletico and San Lorenzo confirmed that the transfer -- reported to total six million pounds -- will be finalised once Correa has recovered.