Celtic legend John Clark has died at the age of 84, the club has confirmed.
The defender was one of the famed Lisbon Lions who helped Celtic become the first British team to win the European Cup in 1967.
Clark spent nearly half a century at the Glasgow club in various capacities - as player, coach, assistant manager and kit man.
He made over 300 appearances for Celtic after making his debut in 1959.
John Clark has died at the age of 84
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The Parkhead club released a statement saying: "Everyone at Celtic Football Club is deeply saddened at the news that legendary Lisbon Lion, John Clark has passed away at the age of 84."
Clark's greatest achievement came on 25 May 1967 in Lisbon, when Celtic defeated Inter Milan to lift the European Cup.
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The victory made them the first British club to win Europe's premier competition.
That historic season saw Celtic complete an unprecedented quadruple. Clark and teammate Tommy Gemmell were the only members of Jock Stein's squad to feature in all 59 matches.
During his 13-year playing career at Celtic, Clark amassed 15 major honours. These included six league titles, four League Cups, three Scottish Cups and the European Cup triumph that immortalised him as part of the Lisbon Lions.
Celtic manager Brendan Rodgers paid tribute to Clark, saying: "Greatness is a word people throw around, but for John Clark, it is a very fitting tribute.
John was instrumental in delivering our greatest day ever and his achievement is forever etched in Celtic's proud history."
Chairman Peter Lawwell added: "John's passing represents a massive loss to his own family and of course a huge loss to the wider Celtic family.
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John Clark was part of the famous Celtic to become the first British team to win the European Cup in 1967
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"That famous day in Lisbon, which John was such an integral part of, changed our club forever."
Lawwell noted that Clark "gave his life to Celtic both as a player and on our staff in a variety of his roles and his contribution to our great club over so many decades is immeasurable."
After leaving Celtic as a player in 1971, Clark spent two years at Morton before returning to Parkhead in 1973 as a coach.
He worked with the reserve and youth teams before joining Billy McNeill as assistant manager at Aberdeen in 1977.
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The pair reunited at Celtic the following year when McNeill became manager, winning five major trophies together including three league titles.
Clark later managed Cowdenbeath, Stranraer, Clyde and junior side Shotts Bon Accord.
He returned to Celtic for a third time in 1997 as kit controller, a position he held for nearly 20 years. Only Willie Maley, Celtic's first manager, served the club for longer.
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