Tributes have been paid to former Aberdeen and Arsenal defender Willie Young who has died at the age of 73.
The defender featured over 180 times for the Dons before enjoying FA Cup glory with the Gunners in 1979, with his career best remembered for forcing a change in the laws of football.
He was responsible for the creation of the "professional foul" after his tackle on West Ham striker Paul Allen in the 1980 final of the FA Cup.
A statement from Aberdeen on Friday night reads: "Everyone at AFC was saddened this evening to learn of the passing of our former player Willie Young.
"Between 1970 and 1975 the centre half made 188 appearances for the Dons, which included 11 games in Europe. He also scored 14 goals.
"Our thoughts are with his family and friends at this difficult time."
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Arsenal added in their own tribute: "Everyone at the club is deeply saddened to learn of the passing of our former defender Willie Young, aged 73.
"The Scottish under-23 international joined us in March 1977, becoming a rare signing from across north London when he arrived from Tottenham Hotspur.
"Our deepest condolences go out to Lynda, the Young family and their many friends."
Willie Young (left) in action for Aberdeen against Celtic's Lou Macari in the 1971 Drybrough Cup Final
Willie Young (left) in action for Aberdeen against Celtic's Lou Macari in the 1971 Drybrough Cup Final (Image: SNS Group)
Born in the Midlothian village of Heriot, Young's career began with the Dons in 1970, where he soon blossomed into a promising central defender for club and country.
He left Pittodrie for Tottenham Hotspur in 1975 after five years in the Granite City before making the controversial move across North London to Arsenal in 1977.
Young formed a formidable partnership with Irish centre-back David O'Leary, and helped the Gunners to three straight FA Cup finals between 1978 and 1980.
The Scot also picked up a winners' medal in the "five-minute final" of 1979 which Arsenal won 3-2 against Manchester United.
Willie Young (back row, fourth from left) celebrates with the FA Cup trophy in 1979
Willie Young (back row, fourth from left) celebrates with the FA Cup trophy in 1979 (Image: Mike Stephens/Central Press/Hulton Archive/Getty Images)
The following year however, Young etched his name into the game's history by flooring West Ham's Allen as he was bearing down on goal.
He hacked the forward down on the edge of the box to prevent a near-certain goal, and received a yellow card for his foul, sparking debate over the need for a law governing professional fouls.
Automatic red cards for the "denial of a clear goalscoring opportunity" were introduced in 1982.
Young also featured in the 1980 European Cup Winners' Cup Final, which saw Arsenal fall to defeat against Valencia in Brussels.
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Controversially, Young never played for Scotland after being handed a lifetime ban following an altercation in a Danish nightclub that saw the "Copenhagen Five" banned from the national side.
Young, Joe Harper, Arthur Graham, Billy Bremner and Pat McCluskey, were all excommunicated, but Harper and Graham were cleared of any wrongdoing and later reinstated.
The punishment meant one of Scotland's most promising defenders never got the chance to pull on the dark blue jersey, and in 1981 he left Arsenal for Brian Clough's Nottingham Forest.
Young called time on his career in 1984 due to injuries after brief stints with Norwich City, Brighton and Hove Albion and Darlington, before spending 19 years running a pub in Nottingham.