Ecuador international defender Pervis Estupinan pose for an image wearing AC Milan Jersey. Photo courtesy of AC Milan.
The left-back joins a Milan side that missed out on European qualification last season after their worst Serie A finish in a decade.
The club brought back former manager Massimiliano Allegri for a second spell in May and signed former Real Madrid midfielder Luka Modric earlier this month.
Estupinan, 27, made 104 appearances for Brighton after joining the Premier League club from Villarreal in 2022.
"I have enjoyed working with Pervis and he has made a significant contribution to the club during his time here," said Brighton boss Fabian Hurzeler.
"He is at the stage of his career when he wants a fresh challenge and this opportunity to play in Serie A gives him that. I'd like to thank Pervis for his contribution to the club and wish him all the best for the future."
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