German website Kicker claims that an instalment due to Frankfurt on the Sebstian Haller move to West Ham remains unpaid in August.
According to Kicker sources, the Hammers apparently wanted to divide the six million euros instalment into several smaller instalments, which Frankfurt flatly refused. Frankfurt turned to FIFA, which gave West Ham a deadline to explain withholding payment.
The report says West Ham still owe 24 million euros to Frankfurt in total.
A source close to the club refused to go into details citing confidentially just saying the issue is being dealt with.