In an interview with French broadcaster SFR Sport (h/t MailOnline's James Dutton), Diouf elaborated upon the rocky relationship he held with Gerrard, as well as another former Anfield team-mate, Jamie Carragher:
People told me at Liverpool, there was some guys you could not touch, but I touched them. That is why it was complicated for me.
Stevie G and Jamie Carragher, the two scousers.
When I arrived I showed him he was nothing at all. He was nothing at all. I asked him to tell me in which big competition, Euros or World Cup, people think about him.
Diouf appeared on SFR Sport alongside former France and Arsenal midfielder Emmanuel Petit. The ex-Senegal attacker made clear he admired Gerrard's ability on the pitch but never saw eye to eye with him off it:
I repeat. I respect the player, very big player, but the man, I do not respect. And I told him, I let him know that. With all my respect I let him know. For me in Liverpool, he was not just a player like anyone else. He had to work and play his football as I had to work and play my football.
Then as you know, there were some brown-nosers, who went to the manager to repeat what I said. That was the real problem. When Gerrard did that, we had an argument, like real men.
That is why he does not like me. He knows I say what I think, that when it is not right, no problem, I am up for it.
Diouf moved to the club in 2002 following a £10 million acquisition by then-manager Gerard Houllier, and he said Gerrard was "afraid" of looking into his eyes.
The rivalry was reignited in September 2015, when the Gerrard voiced his lack of respect for his former team-mate in his autobiography, My Story, per David Prentice of the Liverpool Echo.
Fox Sports' Daniel Garb noted Diouf wasn't likely to be among those mourning Gerrard's retirement:
Diouf departed Liverpool for Bolton Wanderers in 2005 and last played in the Premier League in 2010-11, and it appears the former Reds bad boy can't get over his disdain for one of the team's greatest heroes.
Gerrard announced on Thursday that he was hanging up his boots after playing two seasons in Major League Soccer with the Los Angeles Galaxy, while Diouf had spells at Doncaster Rovers and Leeds United before finishing his career at Malaysian outfit Sabah FA.