West Ham United have reportedly agreed a fee to sign the 25-year-old striker.
West Ham look set to miss out on Maxi Gomez who arrived at Valencia for a medical on Thursday.
But the Irons have moved quickly to identify a new striker target and now there is a lot of speculation about signing the 25-year-old hitman.
L'Equipe have reported that both clubs have agreed on a €40 million deal [£35.8m] and that personal terms are now being discussed.
Haller, who stands at 6'3, might be an ideal replacement for Marko Arnautovic, who moved to China a little earlier this month.
The big man scored 20 goals for the Bundesliga side across all competitions last season and it'll be interesting to see how he fares under Manuel Pellegrini, if a transfer materialises.
West Ham will probably need another striker too, having lost Andy Carroll on a Bosman, but Heller would definitely be a good start.
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