Legendary footballer Diego Maradona underwent successful brain surgery for a blood clot in a specialist private clinic in Olivos on Tuesday, his doctor said.
"We managed to successfully remove the clot. Diego coped well with the surgery," Leopoldo Luque said at Clínica Olivos on the outskirts of the capital. "It's under control, there's a little drainage [of blood]. He'll remain under observation."
World Cup winner Maradona had been taken to hospital in La Plata – where he is the coach of top-flight side Gimnasia y Esgrima La Plata – on Monday for a series of tests after feeling unwell.
A scan revealed the blood clot, and on Tuesday he was transferred to the specialist clinic in Olivos.
Maradona, who turned 60 on Friday, has suffered ill health before. He has survived two heart attacks, and also contracted hepatitis and undergone gastric bypass surgery.
Groups of fans congregated outside the clinic with banners showing Maradona's face and the words "Come on, Diego!"
"I came with my wife to support the greatest player of all time," fan Oscar Medina told AFP. "Once more his health has played a trick on him but he has antibodies to recover with the help of the people."
Earlier on Tuesday, Luque insisted it was "a routine operation" and that Maradona was "lucid" and "calm."
Local media speculated the clot was the result of a blow to the head.
Luque said the clot was "imperceptible" and that those suffering from one rarely remembered receiving a knock to the head.
"The operation consists of a small incision to drain the blood. In 24 or 48 hours the patient can leave the hospital," neurosurgeon Raul Matera told TyC Sports channel.
Maradona's daughter Dalma said she had visited her father after his surgery but did not give further details of his condition.
"I just want to thank everyone for the constant displays of love for my dad, for my sister and for me, thanks to everyone who prayed for him," she tweeted on Wednesday morning.
Maradona was transferred from the hospital in La Plata, 60 kilometres (37 miles) south of Buenos Aires, to the capital at 6pm local time, accompanied by one of his daughters, Giannina.
Dozens of Gimnasia fans outside the La Plata hospital chanted his name as he left.
Earlier in the day, Luque claimed Maradona was feeling "much better and eager to leave" hospital but insisted the patient was suffering from anaemia – a lack of iron in his system – and dehydration.
Luque said that had left Maradona feeling "very weak, very tired." After further tests, he was diagnosed with the blood clot.
He also suggested Maradona's lifestyle had contributed to his condition.
"He's an elderly patient with many pressures in his life. It's a time when we must help him. It's very difficult to be Maradona," Luque said of the star, who celebrated his 60th birthday on Friday.
He said it was a condition that also affected Vice President Cristina Kirchner when she was president.
The doctor ruled out any link to the coronavirus pandemic, which is ravaging Argentina, with much of it still under confinement.
Maradona is considered at a high risk of coronavirus complications should he be infected.
Last week, he began self-isolation for the second time after a bodyguard displayed coronavirus symptoms, though he later tested negative.
He joined his players briefly at the club's training ground on his birthday, but had obvious difficulty walking and had to be helped away by his assistants after staying only 30 minutes.
"It breaks my heart to see him like this," Giannina tweeted the next day.
'He needs support'
Maradona has difficulty retaining iron due to gastric bypass surgery he underwent in 2005 to lose 50 kilogrammes (110 pounds), leaving him prone to anaemia, Luque said.
Though he has recovered from a well-documented addiction to hard drugs, Maradona takes medication in the form of tranquilisers and anxiolytics.
"With a patient on medication, there are times when hospitalisation serves to adjust that medication. That's good," said Luque.
Alongside Brazil's Pelé, who turned 80 last month, Maradona is widely regarded as one of the greatest footballers of all time.
Messi sends support
Argentina's greatest current player issued his support for Maradona on Wednesday, as wishes of good health flooded in from football luminaries across the world. Barcelona captain Lionel Messi sent Maradona "all the strength in the world" in a message of support.
"Diego, all the strength in the world. My family and I want to see you well as soon as possible," Messi wrote on his official Instagram account under a photo of him accompanied by the legendary World Cup winner.
"A hug from the heart!" he added.