(CNN) -- The man tasked with investigating the World Cup bidding process for the 2018 and 2022 tournaments resigned Wednesday, plunging world football into turmoil.
Michael Garcia's resignation followed world governing body FIFA's decision to throw out his appeal after he complained about the way his report into the bidding process had been summarized by German judge Hans-Joachim Eckert -- FIFA's independent ethics adjudicator.
"I disagree with the Appeal Committee's decision," said the American lawyer Garcia -- the chairman of the Investigatory Chamber of the FIFA Ethics Committee -- in a public statement.
"It now appears that, at least for the foreseeable future, the Eckert Decision will stand as the final word on the 2018 and 2022 FIFA World Cup bidding process.
"No independent governance committee, investigator, or arbitration panel can change the culture of an organization."
FIFA president Sepp Blatter said he was surprised by Garcia's resignation but that the "work of the Ethics Committee will nonetheless continue."
"Pending the election of a new chairman of the Ethics Committee by the FIFA Congress, the FIFA Executive Committee will appoint an acting chairman to serve as a replacement for Mr Garcia," added Blatter, who will be at FIFA ExCo's meeting in Marrakech on Thursday and Friday.
However Jerome Champagne, who is standing against Blatter in the 2015 FIFA presidential election, said Garcia's decision was "a step backwards."
"We need to know what happened before and after the 2 December 2010 vote," added Champagne, referring to the date Russia and Qatar won the right to stage the 2018 and 2022 World Cups.
"When will the facts be known fully, transparently and above all without suspicion? When will we be able to start rebuilding FIFA's image? And we need to protect the World Cup."
Garcia said his decision to resign had also been in influenced by FIFA's "lack of leadership."
"Now even FIFA's very own lead investigator has recognized what many of us have warned for months: its self investigation process is neither valid nor credible," said U.S. lawyer David Larkin, who has been a campaigner for greater accountability from FIFA.
It has been a difficult few months for Garcia.
In September the American said for the first time that his report should be made public with redactions.
FIFA rejected his request on the grounds that witness confidentiality for his work could prove difficult to sustain if the report was published.
Then Eckert published his summary, prompting Garcia to respond by saying the German judge's 42-page report contained "numerous materially incomplete and erroneous representations."
In his resignation statement Garcia went even further.
"A brief I filed with the FIFA Appeal Committee on November 24, 2014, outlined the Eckert Decision's most serious failings," said the American lawyer.
"Among other points, the brief explained why, when viewed in the context of the Report it purported to summarize, no principled approach could justify the Eckert Decision's edits, omissions, and additions."
After Eckert's summary was published, Garcia also faced pressure from two whistle-blowers.
Phaedra Al-Majid and Australian Bonita Mersiades gave evidence to Garcia and claim he broke his promise over an offer of anonymity if they helped with his investigative report.
The two women insist that assurances were given to them both in private and public that they would not be compromised after agreeing to give evidence "through a sense of natural justice and a desire to bring closure to a long running chapter in our lives."
The women were not identified by name, but they contend they were "clearly identifiable" in the summary of Garcia's report.
However, FIFA's disciplinary committee said Tuesday there "were no grounds to justify the opening of disciplinary proceedings" given "the breach of confidentiality claim had no substance."
Responding to Garcia's resignation, Mersiades welcomed his decision, given he "agrees with what many of us have long stated -- that FIFA is incapable of reform or cultural change with its current leadership."
Al-Majid described the American's departure from FIFA was "one more, emphatic exposure of FIFA's self-protecting corruption."
She added: "FIFA has no ethics. Its rules are a farce. Not even an extensive, purportedly independent, two year investigation and report could affect its culture.
"Why would anyone believe or trust anything it says?"