The Hammers launched the inquiry lastmonth after reports emerged revealing Olympic Park Legacy Company employee Dionne Knight had worked for the club on a consultancy basis during the bidding process.
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The OPLC are holding their own inquiry into the matter, which could put West Ham's plans to take over the stadium after the 2012 Games in jeopardy.
West Ham were named the preferred choice to move into the stadium in February, beating off competition from Tottenham, who want a judicial review of the decision.
A statement from Upton Park claims the findings from the inquiry, conducted by barristers Blackstone Chambers, 'completely exonerate' the club.
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The statement read: '(The inquiry) concluded firmly that Ms Knight's work had in no way affected the integrity of the joint West Ham United-London Borough of Newham bid which was approved by the Olympic Park Legacy Company.
'The findings - which completely exonerate the club over the matter and showed it acted lawfully at all times - came after the consideration of all relevant correspondence and documentation, along with statements from all relevant officials.
'The report found no confidential information was passed by the OPLC to West Ham United through Ms Knight. Similarly, it found that no person at the club has at any point considered themselves to have an improper source of information or influence within the OPLC.'
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Ms Knight was suspended by the OPLC after admitting she had worked as a paid consultant for West Ham.
The report claimed the payments were secret but West Ham insisted her work was 'transparent' and immediately said they would launch legal action against The Sunday Times and Tottenham.
Today's statement continued: 'West Ham remain in contact with police with regard to the serious matter of a private investigator acting unlawfully, reportedly under instruction by Tottenham Hotspur.'
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