West Ham have confirmed the signing of Frankfurt striker Haller on a five-year deal for club-record £45m.
The Hammers have paid £42.5million to acquire the services of the 25-year-old, in a deal which eclipses that of former record signing Felipe Anderson.
Haller has put pen to paper on a four year deal with the east London club, and will join his new team-mates at their pre-season training base.
West Ham will pay an initial £36m for Haller with a further £6.5m due in add-ons as part of the deal.
According to Opta, Sebastien Haller was directly involved in 24 goals in the Bundesliga last season (15 goals, 9 assists); the only striker with more in 2018-19 was Bayern Munich's Robert Lewandowski (29).
Hammers introduce their recording signing at the end of their third kit reveal