With a vote on the FIFA leadership looming next year, football's governing body has been stung by the resignation of its leading corruption investigator, top US lawyer Michael Garcia, over the handling of his report.
European media reports have said a vote may be held on Friday on a proposal to publish the report, but Blatter has insisted so far that it cannot be published for legal reasons.
Garcia quit as head of FIFA's investigation chamber on Wednesday, hitting out at the "lack of leadership" by FIFA over the inquiry into the bids by Qatar and Russia.
Qatar, which has been the focus of corruption allegations, has strongly denied any wrongdoing in its successful campaign for the 2022 World Cup.
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In his resignation statement, Garcia said however that he had found "serious and wide-ranging issues" in the bid process for the 2018 and 2022 World Cups.
FIFA rejected his appeal against the summary on Tuesday, declaring it "not admissible".
Blatter said he was "surprised" at the resignation but has made little comment about the next steps in the dispute that has led to widespread condemnation of FIFA's leadership.
UEFA president Michel Platini said that Garcia's resignation was a "new failure" by the world game's governing body.
Platini is an outspoken critic of Blatter and has called on him to stand down when his current term ends in May.
The two-day meeting broke up late Thursday with no top-level officials willing to comment, said an AFP journalist at the venue.
A news conference is scheduled for Friday afternoon in Marrakech where the issue of the 2018 and 2022 World Cups is certain to dominate.