The way Pioli changed AC Milan

The sun of the Rossoneri, who once reigned supreme in two different places - the Italian national stage or the prestigious battle of European football - seemed to set prematurely. 'AC Milan' has become synonymous with regret due to careless management, ownership problems or lack of proper football project.In the last decade, the challenge of winning the title with Italian club Juventus has been a long way off, and it has become difficult for the Rossoneri to reach the UEFA Champions League from the top four in the points table.

Source
The biggest change came in the club's management council after the transfer of ownership of traditional Italian club AC Milan to Elliott Corporation. Former star footballer Paolo Maldini has been called up for the post of technical director. Experienced Ivan Gajinis was brought in from Arsenal as CEO. Structural changes were made to make the club's scouting department more dynamic, up-to-date.The results were found in a short time. The Maldivians were able to bring in some very talented young players for a small transfer fee. However, when it comes to Milan's resurgence, the biggest and most important decision was to fire coach Marco Giampaolo and hand over the coaching job to another experienced coach, Stefano Pioli.

Source
Although the number of talented players in the squad increased after the Maldini-Gazinis took charge, I don't know why they could not do justice to their price on the field. After Jennaro Gattuso stepped down, veteran Marco Giampaolo was given the opportunity to take charge of the Rossoneri. But he could not use it at all.Under him, AC Milan played seven matches and won only three. Six of the seven matches were against middle and lower order teams. Eventually Maldini sacked him as well, with Stefano Pioli being announced as the new coach of the Rossoneri.

Stefano Pioli's start as coach was not good at all. Italian mastermind Gasparini's early 5-0 defeat to Atlanta saw everyone, from supporters to former club players, beat Pioli. But that match changed Pioli's disciples radically.Chalhanoglu, Ibrahimovic, Sandro Tonalira quickly moved away from the traditional defensive style of football to focus on high-pressure football. Let’s take a little break from Stefano Pioli’s AC Milan chapter.

Source
There was no specific formation of AC Milan in the time of Marco Giampaolo. He has played sometimes 4-4-2, sometimes 4-3-2-1, sometimes 4-3-3. He never picked his best XI. The players have rotated regularly.He blocked the way for the best players of his XI to play in different positions. Former player Suso is an example. He has played under as a right winger, sometimes as an attacking midfielder. Coach Giampaolo was able to get the best out of him in a very short time.