The president of the German Football League has warned that UEFA may quit FIFA if an independent report into the 2018 and 2022 World Cup bids is not published.
Michael Garcia investigated claims of corruption surrounding both bids, but labelled Hans Joachim Eckert's report as "incomplete and erroneous" following its announcement on Thursday.
Dr Reinhard Rauball told German website kicker.de: "The result was a breakdown in communication, and it has shaken the foundations of Fifa in a way I've never experienced before.
"As a solution, two things must happen. Not only must the decision of the ethics committee be published, but Mr Garcia's bill of indictment too, so it becomes clear what the charges were and how they were judged.
"If this doesn't happen and the crisis is not resolved in a credible manner, you have to entertain the question of whether you are still in good hands with FIFA. One option that would have to bear serious consideration is certainly that UEFA leaves FIFA."
FIFA vice-president Jeffrey Webb and fellow executive committee member Sunil Gulati have also called for the report to be published.
