Gullit fears for the Rossonero if they miss out on Champions League qualification this season.
He told La Gazzetta dello Sport: "It reminds me of Chelsea, another team that at the moment is... an enigma. Honestly, I haven't understood what kind of football Milan wants to play.
"In my opinion, they haven't found the right direction: on paper, the squad is strong, especially after the January transfer market, and the victory of the Italian Super Cup seemed to have solved all the problems.
"But that wasn't the case: that win in Saudi Arabia didn't convey any real confidence to the group and there wasn't a significant improvement compared to the first part of the season.
"How do you solve the problem? Like PSG did, when they stopped buying stars, they took a coach, Luis Enrique, with a brilliant playing philosophy and they valorized the youth sector. Another example is Liverpool who replaced Klopp with a coach with the same philosophy and Slot is winning the Premier League.
"Milan needs to find their roots, their DNA. Success cannot be bought, but must be sought with work and the right choices."