The Croat has deemed the Dutchman's attempts to immediately overhaul the entire club "absurd", and also criticised the timing of Paolo Maldini's attack on Rossoneri officials
The Dutchman's position as coach is already under scrutiny - even though he only succeeded Massimiliano Allegri at the helm in January, with reports last week suggesting that the former midfielder's future hinged on the outcome of Saturday's trip to Lazio and Wednesday's meeting with Fiorentina.
In the end, Milan picked up four points from those two games to lighten the mood at San Siro but Boban still feels that Seedorf has a huge job on his hands, arguing that the ex-Netherlands international made a huge mistake in accepting the job midway through the season rather than in the summer.
"He has big heart," the Croat told Radio Deejay. "But he was arrogant. He thought that he was doing everything right and changing everything right away.
"But first he should have understood everything about the structure of Milan.
"Changing so abruptly like this from day one was absurd. In my opinion, he should have started in the summer."
Even though he has been a staunch critic of the current situation at San Siro, Boban does not believe that former team-mate Paolo Maldini was right to weigh into the debate over what's gone wrong at Milan, arguing that the iconic defender's opinions have been coloured by his poor relationship with the club's directors.
"Milan was a family," Boban mused. "Now everything's broken.
"[Maldini] is a really intelligent person but the timing of these comments was not right. He made it because he didn't like the situation his Milan are in.
"He was called by the club [in relation to a potential job] and then there was no follow-up. He will have also suffered because of this.
"In Milan everything has changed compared to our time, especially the concept of Milan as a family.
"Some things have been broken. Times are changing."