Paris St Germain boss Antoine Kombouare claims the club had no choice but to part with Stephane Sessegnon.
The French giants were reluctant to allow the midfielder to leave during the January transfer window, but saw their hand forced by the player.
Having made it clear that he no longer wished to be part of the set-up at Parc des Princes, the Benin international was able to secure a switch to Sunderland.
Kombouare now acknowledges that PSG were right to part with the 26-year-old, as his attitude was all wrong.
"Sessegnon didn't accept competition," he told L'Equipe.
"He saw Ludovic Giuly take his place in the team and he gave up. He put the blame on the rest of the squad and on me,
"He is a quality player but he decided not to come to training anymore, saying 'I want to leave'.
"The club could get up to €8million for his transfer to Sunderland. That would be fantastic.
"That sort of behaviour cannot be tolerated, you have to fight against it.
"If Sessegnon had stayed, he would be an outsider, he would not exist anymore. Today, without him, we are working much better."
Meanwhile, first-choice goalkeeper Apoula Edel has again reiterated his desire to sign a contract extension at PSG.
Talks regarding a new deal have dragged on for some time, but the Cameroonian shot-stopper is confident an agreement is close.
He said: "My contract extension? It will come very soon, do not worry."