
Puerta was signed from Bogotá FC in January 2023 and initially loaned to FC Nürnberg in Bundesliga 2. Puerta made ten appearances for the Werkself in the Bundesliga and the Europa League in 2023/24.
"Gustavo will continue to progress, he's a very talented player as a six or a number eight," said Bayer 04 sporting managing director Simon Rolfes. "We think he will develop really well at Hull."

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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Rüdiger Vollborn has been at the club for 40 years, he holds the record number of Bundesliga appearances for the club (401) and is the only Bayer 04 player to have won both the UEFA Cup (1988) and the DFB Pokal (1993). And the Berliner stayed with the Werkself after ending his impressive playing career as he worked as a goalkeeping coach for the following nine years. Vollborn now works under the Bayer Cross as a fan liaison officer and club archivist. Since February 2021, the personal Black and Red lexicon takes Werkself fans under the heading of 'Rudi recounts...' on a brief trip through the history of Bayer 04 every month…
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Carlotta Wamser has completed a move away from Bayer 04 Women to join Manchester City in England’s Women’s Super League. The 22-year-old Germany international spent one year with the Werkself.
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Werkself-TV shows the highlights of the Bayer 04 women's 1-2 loss against VfL Wolfsburg on the 2nd matchday of the Google Pixel Women's Bundesliga 2026/27.
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Bayer 04 Leverkusen have transferred France U19 international Axel Tape to Spain. The 19-year-old is joining top-flight side Levante UD on a one-year loan. Tape joined the Werkself on a long-term deal from Champions League winners Paris Saint-Germain ahead of the 2025/26 season.
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