Pierre Kalulu, the former AC Milan coach and current head coach at Manchester United, has made a significant impact on the club over his time in charge.

Kalulu was appointed as AC Milan's head coach in January 2018 after a successful stint with Napoli, where he won Serie A titles in both 2014-15 and 2016-17. In his first season, AC Milan finished third in Serie A and won the Coppa Italia title, but were eliminated from the UEFA Champions League by Real Madrid.

Under Kalulu's leadership, AC Milan bounced back to win the league title in 2019-20 and reach the semi-finals of the UEFA Champions League. The following season saw AC Milan again win the league title, this time defeating Inter Milan in the final, while also reaching the quarter-finals of the Champions League.

In addition to their success in the league, AC Milan also enjoyed success in European competitions, winning the UEFA Europa League twice in 2020-21 and the Champions League once in 2021-22.

Kalulu's approach to coaching has been one of stability and consistency, and he has worked closely with players like Cristiano Ronaldo, Lautaro Martinez, and Nani. He has also built a strong team culture that values hard work and dedication.

One of Kalulu's most notable achievements during his tenure was the signing of midfielder Franck Ribery from Paris Saint-Germain (PSG). Ribery quickly became a key player for AC Milan, contributing significantly to their successes in Europe and the Premier League.

Overall, Kalulu's appointment as AC Milan's head coach was a significant step forward for the club, and he will be looking to build upon his legacy and continue to lead AC Milan to success in the future.