The Premier League and the Football Association are to launch a fresh inquiry into West Ham's conduct over the Carlos Tevez affair.
The new investigation, into West Ham's dealings with the striker's representatives after the club had initially been fined £5.5million for breaching league rules over third-party agreements, will be conducted jointly by the FA and the Premier League.
It follows the findings of an arbitration tribunal in favour of Sheffield United and against West Ham last year which decided Tevez should not have been able to play for the Hammers at the end of the 2006-07 season.
A joint statement said: "The Premier League and the FA are to institute a joint inquiry into the views expressed by the Independent Arbitral Tribunal chaired by Lord Griffiths in September 2008, which dealt with a compensation claim by Sheffield United against West Ham United brought under FA Rules.
"The joint inquiry will examine whether the conduct of West Ham United immediately after the Independent Disciplinary Commission's decision of 27 April 2007 amounted to further breaches of Premier League or FA Rules."
The inquiry means West Ham or individuals could face further disciplinary action but say they have nothing to hide from the new investigation.
A club statement on www.whufc.com said: "West Ham United will co-operate fully with the joint inquiry convened by the FA and Premier League.
"We have acted in good faith throughout the various inquiries and investigations into this matter and fulfilled the undertakings given to the Premier League following the initial penalty.
"We have nothing to hide and will ensure that this is once again reflected in our evidence to the FA and Premier League."
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