What is El-Hadji Diouf's problem with Steven Gerrard?
The ex-Liverpool striker is all too willing to criticise his former teammate when given the chance, whether it be about his 'bad mentality' or the fact he never won the Premier League.
Even racism has played a part in the pair's feud, with Diouf claiming Gerrard has "never liked black people" in 2015.
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"When I was in Liverpool, I showed him that I was black, I’m not English," he said. "But I will not let him walk all over me. All the time I spent there, he never dared to look me in the eye."
Well, rather than burying the hatchet once and for all, Diouf has once again renewed his war of words with Gerrard by accusing him of making Mario Balotelli fail at Liverpool.
Speaking to L'Equipe, per the Independent, he said: "I told [Balotelli] not to go to Liverpool. It wasn't made for him, that things couldn't go well with Gerrard, who has never had his talent and then said negative things about him.
"Gerrard is a jealous man who doesn't like men of character. Mario is a good person that you should listen to. He's not a guy who's going to cause problems in the dressing room."
So, according to Diouf, Gerrard is jealous of Balotelli's talent. Not too sure about that one.
We're talking about a man who almost single-handedly steered Liverpool to the Champions League title in 2005 and is widely regarded as one of football's greatest ever midfielders.
On just Balotelli, Diouf added: "There are a lot of things that have been made up about him. People tell tales about him, but they're often a load of rubbish."
He even claimed once that Gerrard is jealous of what he has achieved in football.
"Gerrard is just jealous. What I have done in football, he did not," he said.
"When I came to Liverpool, I came up with the status of boss and he lives there. I am respected in world football. The greatest football experts have appointed me among the seven best players in the World Cup, the top 100 players of the century. Several big players do not belong.
"Everywhere I go out of my country, they worship me. [Gerrard], wherever he goes outside his city of Liverpool, will be insulted."
Diouf is the gift that keeps on giving. Anyway, back to Balotelli, who scored a brace on his debut for Nice on Sunday.
The Italian scored a sixth-minute penalty to open his account in Ligue 1 before heading home in the 77th minute from a dangerous inswinging cross.
There's no doubting Balotelli's talent - let's just hope he uses it this time around.