Celtic are one of the biggest and most successful teams in Scottish football history and over the years they have been blessed with some of the talented players that the game has had to offer such as Kenny Dalglish, Henrik Larsson, Jimmy Johnstone and many more.
However, a key factor in the team’s success over the years has not just been their technical ability and flair, but also their ability to battle for every tackle, fight for every win and ultimately overpower their opponents.
When all else fails, the ability to be physical and grind out results can often be the key to victory and the Hoops have often been blessed with a number of no-nonsense tough tackling enforcers that have been able to win their individual duels across the pitch.
Here GlasgowWorld takes a look at 19 of the toughest players to have ever wore the iconic green and white kit but who do you think was the toughest?
5. Mick McCarthy
Mick McCarthy was an imposing centre back with a huge stride and an even bigger head. The Barnsley born defender's two-year stint at Parkhead in the late 1980s saw him lift one league title and two Scottish Cups before moving on to Lyon. | Ritzau Scanpix/AFP via Getty Ima
6. Dianbobo Balde
Dianbobo Balde was a powerful 6ft 5 centre back that spent eight seasons at Celtic between 2001 and 2009. The Guinean became one of Scottish football's most commanding defenders almost immediately after his arrival from Marseille. | Getty Images
7. David Hay
David Hay narrowly missed out on the chance to be a part of Celtic's famous "Lisbon Lions", making his debut in 1968 - a year after they conquered Europe with victory over Inter. However, during his time at Celtic he proved he was one of the very best on the continent. Primarily a midfielder, Hay was versatile player who could perform an excellent defensive job at both left back and centre back. (YouTube) | YouTube
8. John Hartson
John Hartson was a powerful centre forward with incredible ability to win aerial battles. He fired in 88 goals in 146 games at Parkhead and was a nightmare for defenders to deal with. | Getty Images