Between them, Celtic and Rangers have won 23 Scottish Premiership titles, 17 Scottish Cups, 18 League Cups and both have made the final of the UEFA Cup since the turn of the century - as well as Rangers’ recent run to the Europa League final.
Yes, there’s been some dark days for both Old Firm sides in the past 24 years but also the abundance of quality, talent and skill that have walked in and out of the doors is almost unprecedented. Both sides of the divide have their favourites - but which players would make the ultimate Old Firm XI?
What do you think is the best combined Old Firm starting XI since the turn of the century? Do you agree with our picks?
13. Sub: Stilian Petrov
While Ferguson and Brown felt like more obvious choices, the third spot in midfield was more difficult. McGregor edges ahead of Petrov but he wins a spot on the bench after 10 trophies in eight seasons and for his role in the side that made it all the way to the UEFA Cup Final. | Neil Hanna Photo: Neil Hanna
14. Sub: Nacho Novo
Loved by the Ibrox faithful, his winning penalty in the UEFA Cup semi-final against Fiorentina will go down in Rangers folklore. A key player for the Gers during the 21st century and one of the most loved. | Getty Images
15. Sub: James Forrest
A real unsung hero at Celtic, Forrest has lifted no less than an astonishing 23 trophies with the club. | Getty Images
16. Sub: David Weir
Weir won eight trophies with Rangers and even captained them to the title in the week of his 41st birthday. An important part of the squad that reached the UEFA Cup final, he is more than worth a spot on the bench. Photo: SNS Group Alan Harvey