Scotland great Dave Mackay has died at the age of 80.
Tributes are being led by his former clubs Tottenham, Derby and Hearts.
He enjoyed great success at his boyhood Edinburgh team before moving to Spurs, and was part of their double-winning side of 1961.
Having been persuaded to join Derby by Brian Clough, who described him as Tottenham's greatest ever player - while Alex Ferguson says he would've selected the defender in his all-time best Scotland team.
We were saddened to hear of the death of former captain Dave Mackay who passed away this evening - http://t.co/vt5REPrylR
— Tottenham Hotspur (@SpursOfficial) March 2, 2015
Alan Mullery played with Mackay at White Hart Lane during the 1960s, and he told Sky Sports News the Scot was an "unbelievable player".
"I don't think there'll be anybody built like him again," said Mullery. "He was built like a tank.
"He had great skills like the [Lionel] Messis of this world and [Cristiano] Ronaldos of this world today, but they couldn't play in every position.
"He was the Roy of the Rovers of football."
Download the brand new OffTheBall App in the Play Store & App Store right now! We've got you covered!
Subscribe to OffTheBall's YouTube channel for more videos, like us on Facebook or follow us on Twitter for the latest sporting news and content.
