The east Londoners were due to pay Frankfurt £5.4million (€5.7m) as part of the club record £45m deal for Haller on May 15 but have withheld the payment following a contractual dispute between the two clubs. Frankfurt declined to comment when contacted by Standard Sport but have seen fit to register a complaint with world football’s governing body.
It is understood that the Hammers expect the issue to be resolved in the near future, with sources close to the club insisting they face no issues with funding or cash flow.
A Fifa statement read: “We can confirm that we have received a claim from Eintracht Frankfurt against West Ham. The matter is currently being investigated and consequently we cannot provide any further comments.”
The Hammers did not furlough any staff during football’s shutdown, but did agree wage deferrals with their squad, while manager David Moyes voluntarily deferred 30 per cent of his salary, as did vice-chairman Karren Brady.
Fifa sanctions over the issue range from a reprimand or a warning to a fine or, in the most serious of cases, a transfer ban for up to two windows.
A ban on registering players, however, is usually a suspended punishment or one reserved for repeat offenders. However, the Hammers are confident that the dispute will not reach the stage where sanctions are necessary.