Former Paris Saint-Germain sporting director Leonardo still feels angry over his 13-month suspension that forced him to resign from the French champions.
The Brazilian was handed a nine-month ban in May this year after he deliberately barged referee Alexandre Castro in the tunnel, following the dismissal of Thiago Silva in the club's 1-1 draw against Valenciennes.
Despite lodging an appeal, it proved unsuccessful, landing him another four month ban from official duties until the 30 June 2014.
The decision caused Leonardo to hand in his resignation, as he felt unable to carry out his work under the restrictions placed on him.
"It was impossible to continue my work in Paris because this suspension would not let me give it 100 per cent," Leonardo told Le Parisien.
"What they did to me was very unjust. Everything became too difficult after this suspension.
"I was the main man responsible for the project at PSG, I was very involved with the players and coaches. It's the most exciting project in Europe today," he added.
PSG have been busy once again this summer, with the arrival of Uruguayan striker Edinson Cavani adding to their attacking force.
Serie A's leading scorer last season, Cavani bagged 29 goals, with Leonardo delighted the Ligue 1 champions were able to make the deal happen.
"To have the top scorer in Serie A, Cavani, and the top scorer in Ligue 1, Ibrahimovic, in the same team is incredible," said Leonardo.
"Especially when you can also count on players like Lucas (Moura), (Javier) Pastore, (Jeremy) Menez and (Ezequiel) Lavezzi. PSG have the best attack in the world with those six players.
"It was my idea to bring Cavani and Ibrahimovic together and I insisted it happened."
The Parisians have already claimed their first piece of silverware after they defeated Bordeaux 2-1 in the Trophee des Champions last weekend.
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