Muhammad Ali will still be famous in "two million years", his close friend and author Davis Miller believes.
The critically-acclaimed American writer has penned two books about the former heavyweight champion - who passed away last Friday (03.06.16), aged 74 - and Miller suggested Ali's impact surpasses that of any other popular culture icon in recent history.
He told BANG Showbiz: "Forget Michael Jackson, Ali is going to live on. In two million years' time people will still know the name Muhammad Ali. Think about that, it's incredible. I lived for his fights - I would jump around the living room to his fights. Then I was lucky enough to meet him and then lucky enough to call him my friend."
Ali's remarkable life and career has been turned into an exhibition at the O2 Arena in London, where fans can recall the boxer's incredible rise to the top of his profession.
What's more, the indoor venue is set to screen coverage of Ali's funeral service to the public from 7pm today (10.06.16).
Miller - who helped to create the 'I Am The Greatest' exhibition - thinks it is a fitting tribute to his friend and a remarkable man.
He reflected: "When people walk through the exhibition they will be joined by the singularly greatest man in history. It's a spiritual experience."
Ali's funeral service in Louisville, Kentucky, is set to be attended by a host of big-name guests from all areas of society, including former US President Bill Clinton and Hollywood star Will Smith, who is a family friend.