Players from both sides stood around the centre circle prior to kick-off at Old Trafford, with supporters bursting into applause before the stadium announcer had even finished announcing that a tribute would be observed.

Eusebio was a member of the Benfica team beaten by United in the final of the 1968 European Cup at Wembley Stadium, when Matt Busby's side became the first English team to win the competition.

Bobby Charlton, who played for United in that match, was present for the game with Swansea and he paid tribute to the man known as the 'Black Panther'.

"Without doubt, Eusebio was one of the finest players I ever had the privilege to play against," Charlton said.

"Not only that, he was a true sportsman, as he proved in applauding (United goalkeeper) Alex Stepney for his save in the European Cup final.

"His goals record, for Benfica and overall, is incredible and stands the test of time.

"I met him on numerous occasions after our playing careers had finished and he always represented both his club and his country in exemplary fashion."

United's Portuguese winger Nani also expressed his sadness at Eusebio's passing, writing on Twitter: "You'll be forever in our hearts Eusebio. Rest in peace legend."

Eusebio, who scored 733 goals in 745 professional appearances, won the Ballon d'Or in 1965 and finished as the top scorer at the 1966 World Cup in England.