
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."

Werkself-TV shows the highlights of the Bayer 04 women's 1-3 loss against Werder Bremen on the 26th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
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Bayer 04 Leverkusen have agreed a conract extension with home-grown talent Sofie Zdebel by a further year ahead of schedule. The 21-year-old Germany U23 international will stay at the club until 30 June 2028.
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Bayer 04 could only manage a 1-1 draw at home to Hamburg in the final game of the 2025/26 Bundesliga season as they finish in sixth place and qualify for the UEFA Europa League. Patrik Schick missed a first-half penalty before Fabio Vieira put the visitors ahead on the hour. Jarell Quansah’s deflected header in the 79th minute earned a point to finish the campaign.
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Jonas Omlin was given an official send-off ahead of the final Bundesliga game of the season at home to Hamburg. The 32-year-old Swiss goalkeeper joined the Werkself on loan for the second half of the campaign from Borussia Mönchengladbach in the winter.
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