The former Brazil international feels that the striker can't be compared to the Primera Division duo, and isn't too worried by the Parisiens' slow start to the season.
The capture of the towering attacker was one of the shocks of the summer transfer window, but Leonardo believes the signing of high-profile names by PSG will no longer be a big deal in a few years' time.
"We can talk about Messi and Cristiano Ronaldo, but they are nothing like Ibrahimovic. At almost 100 kilos and 1.96 meters, he's the best target man in the world," Leonardo was quoted as saying by L'Equipe.
"When we signed Thiago Silva and Zlatan this summer, everybody was really impressed with what we had done. In two or three years' time, people will react completely different."
The Brazilian then went on to stress that the club has not made an offer for Lille defender Mathieu Debuchy.
"He is a great player and he has the same agent as [Mathieu] Bodmer, so you could say that we have already been in touch with him," he said. "We have never discussed this issue, though. We have not made an offer for Debuchy and have not contacted Lille."
PSG has been struggling to find its best form in the opening weeks of the new season, but Leonardo isn't worried.
"The outcome of the season does not depend on the opening two games. I am not worried about our start. However, a PSG player should never want to settle for a draw."
Paris Saint-Germain resumes Ligue 1 action on Sunday when it takes on Bordeaux.
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