City appealed for information after the incident at Veltins Arena on February 20, with some members of club staff remaining in Germany to support the fan’s family.
Polizei Gelsenkirchen said the supporter had suffered a “massive traumatic brain injury” as they launched an investigation.
And police in Germany have now made an arrest relating to the incident.
A 30-year-old man from the city was arrested on Monday morning in the Buer district and is now being held.
Polizei Gelsenkirchen’s statement read: “The police arranged a homicide division to help investigate the case. Their extensive investigations directed to the contemporary identification of a suspect.
“The 30-year old man from Gelsenkirchen is a member of the so-called ‘Hugos’, a problematic grouping of fans.”
City won the last-16 first leg 3-2 after late goals from former Schalke winger Leroy Sane and Raheem Sterling.
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