Former Celtic defender and assistant manager Sean Fallon has died at the age of 90, the club have announced.
Fallon made more than 250 Celtic appearances in the 1950s and assisted Jock Stein in the next two decades.
He also won eight caps for Republic of Ireland and had a brief spell as Dumbarton manager.
Celtic chief executive Peter Lawwell described the news as "very, very sad" and said the club's thoughts were with Fallon's family.
"Sean Fallon was a Celtic legend who devoted much of his life to the club he loved," he added.
Fallon played an important role as Celtic assistant
"He was, of course, a supporter, first and foremost, and he was proud to have worn the green and white Hoops that he loved.
"He did so with fearless distinction over eight years in the 1950s, and Sean was at the heart of all of our triumphs, including that famous 7-1 League Cup victory in 1957.
"Ten years later, he was part of our greatest ever success, winning the European Cup in Lisbon. Working alongside Jock Stein, Sean helped to deliver that trophy, along with nine consecutive league titles and numerous other trophies.
"He was an integral part of the club's success, and also played a vital role in identifying talented young players who would go on to become great Celts."
Fallon was influential in bringing players like Tommy Gemmell, Danny McGrain and Kenny Dalglish to Celtic and manager Neil Lennon said meeting him was "a privilege".
"He was always a very humble man when you met him, even though his achievements in the game were extraordinary," added Lennon.
"It was a fitting tribute that Sean unveiled the championship flag back in August and the welcome he received from the supporters spoke volumes. We will all miss him."