The Qatari official has been suspended temporarily by the governing body of world football, just days after his lifetime ban was lifted by the international tribunal
The new suspension on the Qatari comes as a result of the Court of Arbitration for Sport [CAS] overturning the lifetime ban imposed by Fifa last year.
Bin Hammam is now unable to take part in any football-related activity "to prevent interference with the establishment of the truth in respect of a preliminary investigation".
"The investigation aims, among other things, to assess the PwC report of July 13 in respect of potential misconduct on behalf of Mr Bin Hammam in the light of the provisions of the Fifa Code of Ethics, and the prospects of collecting further evidence relevant to the recently closed CAS proceedings in the case of Mr Mohamed bin Hammam," the statement issued by the governing body read.
Earlier in the month, AFC provisionally suspended Bin Hammam after an internal audit revealed more wrongdoings from the organisation's former president.
When faced with the decision from CAS, the governing body for Asian football decided that Bin Hammam's suspension remained in place.