He won 10 major honours as a player in British and European football.
The Edinburgh-born player also won 22 caps for his country and was named ‘Footballer of the Year’ in both Scotland and England.
Paying tribute, Spurs said, “He was one of our greatest ever players and a man who never failed to inspire those around him.”
After winning all three domestic honours in Scotland with Hearts, Mackay joined Spurs in 1959. He helped the north London club achieve the double of league and FA Cup, then won the FA Cup again in 1962 and 1967.
Spurs described him as “the heartbeat” of their double-winning side and said he played a “vital role” in their 1963 European Cup Winners’ Cup success despite missing the final through injury.
Mackay joined Derby County in 1968 and was named joint ‘Footballer of the Year’ the following season. He helped his new side, managed by a young Brian Clough, to the Second Division title before a player-manager spell with Swindon Town.
Mackay then managed Nottingham Forest before succeeding Clough at Derby and leading the Rams to the First Division crown in 1975. He also managed Walsall, Doncaster, Birmingham as well as spending more than a decade leading sides in the Middle East.
The Scot was once described by Manchester United’s George Best as the “hardest man I have ever played against”.