
The 23-year-old joined the Werkself in 2014 and he made 215 appearances for Bayer 04. "Julian joined us as a 17-year-old at a time when he was sought after by a lot of clubs but he opted to play for us and he has developed wonderfully since then making his international debut during his time in Leverkusen," said sporting managing director Rudi Völler. "With him, our approach of bringing through young, highly talented players early at a top level, achieving a lot with them and thereby significantly increasing their transfer value worked out too. We would have liked to have held onto him a bit longer," declared Völler, "but with the signing of Kerem Demirbay from Hoffenheim we have already found a suitable replacement."
Bayer 04 sporting director Simon Rolfes said, "Over the past few months, Julian has matured into a top player in a different position under coach Peter Bosz. Now he has decided to play somewhere else after five and a half years. We have already reacted to that in terms of personnel," said Rolfes. "And we will continue to strengthen our squad to maintain our competitiveness next season."

Midfielder Ruby Grant is leaving Bayer 04 Leverkusen and joining Portuguese runners-up Sporting CP a year before her contract expires. The 24-year-old has been at the Werkself since January 2025.
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Bayer 04 have loaned Brazilian full-back Arthur to Bundesliga side Werder Bremen for one year. Arthur Augusto de Matos Soares – the full name of the right-back – has a contract with Leverkusen until 30 June 2031. At Werder, the 23-year-old is expected to make an impact and help the long-established club further consolidate their position in the Bundesliga.
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Bayer 04 have loaned defender Jeanuel Belocian to Spanish top-flight side Racing Santander. The 21-year-old defender joins the team currently ninth in La Liga until the end of the current 2026/27 season. Belocian’s contract remains valid until 30 June 2029. Last season, the 1.86-metre-tall U21 international was loaned to VfL Wolfsburg for six months.
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He knows the dressing room, the pitch and the club. But, above all, he knows the feeling of playing for the Werkself at the BayArena: Moussa Diaby is back in Leverkusen after three years. The lightning-fast winger has signed a contract with Bayer 04 until 2031 and he will once again wear the number 19 jersey. The left-footed player previously played for the club from 2019 to 2023, having arrived in the Rhineland from his native France as a promising young talent and eventually leaving the club – having established himself as one of the Bundesliga’s best attackers – to join Aston Villa in the Premier League. Now he has returned to Bayer 04 from Al-Ittihad FC in Saudi Arabia.
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