Rio Ferdinand, 38, began his football career playing for various youth teams before settling at West Ham United.
He progressed through the youth ranks and then made his professional Premier League debut in 1996.
His achievements in football attracted the attention of Leeds United, where he transferred in 2000 for a record-breaking fee of £18million.
Two years later, in 2002, he joined Manchester United for around £30 million, breaking the transfer fee record for a second time.
Rio has also played for England and more recently Queens Park Rangers, but in May 2015 he announced his retirement from professional football.
But the former footballer has not fallen out of the limelight.
Rio has regularly been appearing on TV as a BT Sport pundit, and he has now launched a new career as a professional boxer.
So how much money will he be taking into the ring with him?
According to Celebrity Net Worth, Rio’s net worth is estimated at $ 75million (£55.3million).
Over recent months Rio has been posting several social media videos showing him boxing and working with personal trainer Mel Deane.
Rio may now follow in the footsteps of former Birmingham City midfielder Curtis Woodhouse and former Crystal Palace forward Leon McKenzie, who became professional boxers after quitting football.
How does Rio’s net worth compare to other footballing stars such as Wayne Rooney?