The 28-year-old returns to Leipzig after playing for the club from 2019 to 2023. He scored 70 goals and won two German Cups during that stint, and finished as joint top scorer in the 2022–23 Bundesliga season.
“He has already shown the exceptional talent that he brings to the table and that he can make a difference in games,” Leipzig’s managing director for sport Marcel Schaefer said in a statement.
Nkunku, who began his career at Paris Saint-Germain, moved to Chelsea in 2023 and struggled with injuries at Stamford Bridge, but won the Conference League and Club World Cup with the Premier League side.
He signed for Milan last year and scored eight goals in 35 appearances in the 2025-26 season.
He has made 18 international appearances for France.
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