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Ibrahimovic and Cavani arrived at PSG a year apart, both coming from Serie A in 2012 and 2013 respectively as the club's new Qatari owners looked to make a huge push in European football.
They played 107 times together, winning three consecutive Ligue One titles and a number of domestic trophies.
But according to Michael Ciani, who played with Ibrahimovic at LA Galaxy, the Swedish superstar did not like Cavani, one of four people in his career that he hated.
"He told me that everything was fine with [then-manager] Laurent Blanc at PSG," Ciani told RMC Sport.
"The only person he did not get along with was Cavani.
"He told me that he only hated three or four people in his career… and one of them was Cavani.
"If you are close to Cavani, Ibra does not like it. Either you are with Ibra, or you are against him."
Both Cavani and Ibrahimovic scored over 100 goals for PSG and would end up making the same next move in their career at different stages.
Ibrahimovic joined Manchester United on a free transfer after leaving PSG in 2016 and Cavani would do the same four years later after.
The Uruguayan actually beat Ibrahimovic's goalscoring record in Paris, finishing with 200 goals in 301 games.
Later on Cavani did have some difficulty with Neymar, with the two having disagreements over penalties during their time as teammates.
Cavani has scored twice in 17 games in an injury-hit season for United this term and looks nailed on to leave this summer.
Ibrahimovic, meanwhile, has found the net eight times for league leaders AC Milan and looks to deliver the Scudetto at the age of 40.