Diego Maradona will undergo surgery for a subdural haematoma later today, according to his doctor.
The Argentina great was admitted to hospital in La Plata on Monday, with dehydration and anaemia given as the reasons for his hospitalisation.
The operation, which will take place at Olivos Clinic in Buenos Aires province to address the blood clot on the brain, was described by Dr Leopoldo Luque as "routine surgery".
"We are going to operate today. He is lucid, he understands, he agrees with the intervention," Luque said.
Maradona, who won the World Cup with Argentina in 1986 and is widely considered to be one of the greatest players of all time, coaches local club Gimnasia y Esgrima.
He last appeared in public on his 60th birthday on Friday before his side's league match against Patronato.