West Ham are in talks with Bundesliga side Hoffenheim regarding a potential deal for midfielder Steven Zuber, according to reports.
The Hammers are said to be ready to pay £8.6m for the 25-year-old Switzerland international.
Hoffenheim are keen to keep hold of their star asset and are expected to hold out for a bigger fee.
Zuber has caught the eye in Germany this season, scoring three times, as his side battle to finish in the Champions League places.
A potential campaign in Europe's top club competition could throw the move into some doubt, though, meaning the Hammers would need to look elsewhere for summer acquisitions.