Martin Adeline is transferring from ES Troyes AC to Hambourg SV for an estimated fee of 4 million euros. This transfer follows a season in which he contributed 21 assists in 32 matches and helped the club achieve promotion to Ligue 1. Adeline stated that the discussions with HSV immediately gave him an excellent feeling, and that he was convinced by the charm of the club, its supporters and the stadium, as well as the opportunity to progress in the Bundesliga. He added that he is very grateful to everyone who trusted him and now looks forward to meeting his teammates and playing for the first time at the Volksparkstadion. ES Troyes AC thanked Adeline for his commitment and wished him success.

According to Bild, Martin Adeline has transferred from Troyes to Hamburger SV for 4 million euros.

According to SkySportDE, a full agreement has been reached with Troyes for Martin Adeline. He is set to sign a contract with Hamburger SV until 2030, and a medical is scheduled for Monday. The transfer fee is €4m.

Hamburger SV are reportedly close to signing 22-year-old Martin Adeline from ESTAC Troyes, with talks between the clubs at an advanced stage. A complete verbal agreement has been reached between the player and the German club for a long-term contract. FT had previously reported on Hamburger SV's interest in May. There have been differing reports on the transfer fee; L’Équipe initially mentioned a figure of six million euros, while Sky suggested the final amount would likely be less. The Hamburger Abendblatt reported that Hamburger SV's current offer is a fixed fee of four million euros plus bonus payments and that the club is reluctant to pay more as Adeline's contract ends in one year. An agreement has been reached for Hamburger SV to purchase the midfielder for four million euros plus bonuses, and a medical is scheduled to take place soon. 1. FC Köln was also reportedly interested in the French player, who is considered a potential replacement for Fábio Vieira in Hamburg. He is a France U20 international with 8 caps and 1 goal. His current Transfermarkt market value is €10.00m. During the 2025/2026 season in Ligue 2, he made 84 appearances, scoring 13 goals and providing 16 assists.