Chelsea manager Jose Mourinho has labelled Eusebio "immortal" after the former Portugal forward died at the age of 71.
Nicknamed the Black Panther, Eusebio was regarded as one of the best players of all time and helped Portugal to third place at the 1966 World Cup, finishing as top scorer in the tournament with nine goals.
The Mozambique-born striker made his name at club level with Benfica, winning 11 league titles during a 15-year spell there and two Golden Boot awards as Europe's leading goalscorer.
He also notched 41 goals in 64 appearances for Portugal.
Mourinho, speaking ahead of his side's FA Cup third round tie at Derby, said he was more than a footballer in Portugal and his feats will never be forgotten.
"He's unique in our country," he told BT Sport.
"He's one of the greatest in the history of football, but for our country he's much more than that.
"Irreplaceable - his place in the history of Portuguese football, but more than that in the history of our country.
"He's a man that doesn't belong to Benfica, doesn't belong to a club, he belongs to a country and I prefer to say that people like him are immortal, because their history and their legacy remains forever.
"So of course I'm very sad, especially my assistant Silvino [Louro] because Eusebio was his coach for a long time, but I'm not so sad because I really feel that he's immortal for our country."
Benfica were unable to confirm details of Eusebio's death but reports in Portugal say he died of a cardiac arrest in the early hours of Sunday morning. He had been in poor health for some time and was hospitalised during Euro 2012 after suffering a heart scare in Poland.
Benfica fans were offered the chance to pay their final respects to the player at the Estadio da Luz.
"Eusebio's body will be brought to the stadium later today and all fans will be able to say goodbye," a club spokesman told Press Association Sport on Sunday morning.
Real Madrid confirmed they will hold a minute's silence at the Bernabeu ahead of Monday's league clash with Celta Vigo and that their players will wear black armbands in respect to Eusebio, with coach Carlo Ancelotti paying his respects in his pre-match press conference.
"It's very sad news," he said.
"We want to send our best wishes to his family and his friends."