(CNN) -- West Ham United could face further action in the Carlos Tevez affair after the English FA and Premier League launched another inquiry into events during the Argentine star's time at Upton Park.
Tevez, right, joined Manchester United after almost singlehandedly saving West Ham from relegation.
The new investigation relates to West Ham's dealings with the striker's representatives after the club had initially been fined £5.5m for breaching league rules over third-party agreements.
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.
"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 brought under Football Association Rules," read an FA statement.
"The joint inquiry will examine whether the conduct of West Ham immediately after the Independent Disciplinary Commission's decision of 27 April 2007 amounted to further breaches of Premier League or FA Rules," the statement added.
Premier League West Ham insist that they have nothing to hide from the new investigation.
A statement on the club Web site 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."