Pascal Gross is set to switch Brighton for Borussia Dortmund, as an offer of £5.9million has been accepted by the Premier League club.
New Brighton manager Fabian Hurzeler said he is eager to "achieve big things and challenge the establishment" during his first press conference.
Brighton have completed the signing of Gambia international Yankuba Minteh from fellow English Premier League side Newcastle.
Former Brighton manager Roberto De Zerbi has moved on to the next chapter of his coaching career after being appointed on a three-year deal to take over as Marseille head coach.
Brighton owner Tony Bloom said 31-year-old Fabian Hurzeler was always a standout candidate after making him the Premier League's youngest-ever permanent head coach.
Ansu Fati has rejoined FC Barcelona after his loan spell at Premier League outfit Brighton.