West Ham demanding Brescia cough up Diamanti cash
The Irons claim they have not been paid money they were due after selling the midfielder for £2m two years ago.
Diamanti - signed from Livorno for £6m in 2009 - was allowed to go home to Italy after just one season, having failed to settle in London.
West Ham are unhappy because they asked for Diamanti's registration by the Italian Football Federation to be suspended in July last year.
The club acted because they had not been paid a due instalment of their transfer fee by Brescia.