The retired Croatia international has given praise to the Serie A star, but feels the release clause connected with his deal at the Partenopei is unjustified
The Uruguay star has netted 22 goals in 28 appearances in the Serie A so far this season and has been linked with a move to Real Madrid, but Boban feels the Partenopei's asking price is unrealistic and should be half as high.
"Cavani is a great player," the 44-year-old told Radio Goal.
"However, I do not believe that he is worth £53m on the transfer market. That’s just my opinion, an honest one. Perhaps he’s worth about half of that figure."
Meanwhile, Boban revealed he is hoping Juventus win their second-leg tie in the Champions League quarter-finals against Bayern, but believes chances for the Italians to proceed are slim after they suffered a 2-0 defeat in Bavaria last week.
"I think Juventus have little chance against Bayern, although I hope that I am wrong.
"Bayern proved that they are clearly better and that just can’t disappear. In order for Juventus to qualify then everything will have to go right."