As two of the biggest clubs in Europe, both Rangers and Celtic have saw some of the biggest names in world football pass through their doors over the years.
With domestic and European success often going hand in hand at both Glasgow giants, a number of huge talents have played and managed at Ibrox and Celtic Park - though many have folded under the pressure of Glasgow goldfish bowl.
But with so many big names coming through the doors at both, who are the richest former Old Firm players and managers in the world in 2025?
Here are the richest former Old Firm players and managers highest yearly salary, according to CelebrityNetWorth.
13. Robbie Keane
Spent just six months with Celtic, signing on loan from Tottenham Hotspur in 2010, but was hugely impressive scoring 12 goals in 16 games. He is still Republic of Ireland's record goal scorer despite retiring seven years ago. Currently manager of Ferencváros, he has a reported net worth of $55million. | Getty Images Photo: Getty Images
14. Roy Keane
A leading football pundits, Keane is one of the English Premier League's most successful captains during his long stint with Manchester United. Ended his career playing for Celtic, the club he supported as a boy, and has a reported net worth of $60million. | Getty Images Photo: Getty Images
15. Steven Gerrard
Labelled by many as the greatest midfielder of his generation, the ex-Liverpool and England ace found success as a manager Rangers, winning the title with the club in 2021. He is officially the richest former Old Firm figure with a reported net worth of $90million. | SNS Group Photo: SNS Group