Lamptey has made a significant contribution to Brighton during his time at the club, making 122 appearances and scoring five goals, while also providing 12 assists.
Brighton manager Fabian Hurzeler expressed his gratitude towards Lamptey, highlighting his value as a player and a person. He praised Lamptey's professionalism and wished him the best for his future, especially in his new opportunity to play in Serie A and European competitions.
Lamptey, who is 24 years old, has signed a contract with Fiorentina that will keep him at the club until 2029. The transfer fee is reportedly €6 million.