The ex-France international is not convinced the duo will operate effectively in tandem for Laurent Blanc's side this season, given the pair's mutual lust for goals
Much has been made over how the arrival of the Uruguay international will impact on the former AC Milan star, who netted 30 times for les Parisiens en route to lifting the Ligue 1 title last season.
The enigmatic Swede has reportedly been put out by the prospect of having to share the spotlight with the €64 million man this term, and Ginola foresees trouble ahead.
"The main questions about PSG this season are: Will Cavani and Ibra get along? And 'Will [Javier] Pastore play?," the former France international told L'Equipe.
"It is important for Cavani to score goals. This is what he will judged on, and the same for Ibra.
"They're both strikers and have to be selfish, so I am waiting to see how they will get along.
"It will be complicated for Pastore, too. He did not have a great season last year, and there is more competition now. There are almost too many good players in attack for PSG."
Meanwhile, Tottenham legend Ginola went on to outline his desire to return to the Premier League in a coaching capacity.
"I will soon get my Uefa A license, which will allow me to coach in the Championship and I hope to get my Pro License by 2014 in order to coach in the Premier League," he said.
"I'm ready for it. I miss the smell of the grass and I miss the players. This is closer to home for me and I could not see myself returning to Clairefontaine."
The 46-year-old, who enjoyed a three-year stint with Spurs until 2000, also revealed how he attempted to persuade chairman Daniel Levy to move for Dimitri Payet, arguing that the Olympique de Marseille signing would have formed a formidable frontline alongside Gareth Bale and Roberto Soldado.
"I have seen Dimitri Payet play, he was excellent last year and is a great recruit for Marseille," he enthused.
"He has everything you need to be an excellent player and can make the difference at any time, a little bit like Eden Hazard.
"I recently mentioned him to Daniel Levy. I said he would have a dream attack if he plays with Defoe, Soldado or Bale - but Marseille had already bought him at the time."