FIFA will allow Switzerland's attorney general access to emails used by Jerome Valcke "if several conditions are fulfilled," AFP reports.
World football's governing body was urged by Switzerland's attorney general, Michael Lauber, to hand over emails used by Valcke, its secretary general who was suspended last week.
Valcke was implicated by a FIFA ticketing partner in using his FIFA and Google email accounts to discuss a 2014 World Cup black market tickets deal.
Lauber stepped up pressure on FIFA to unblock access to Valcke's correspondence, with Lauber's spokesman Andre Marty telling The Associated Press on Wednesday that the prosecutor has filed a request directly to FIFA lawyers.
Following that request, Marty sent a statement to AFP on Thursday that read: "FIFA informed the Office of the Attorney General (OAG) of Switzerland that FIFA will grant access to Mr. Jerome Valcke's email accounts if several conditions are fulfilled.
"Therefore, the OAG still has no access as requested to Mr. Valckes' email accounts."
Valcke denies a ticket agent's claims that he sought cash from sales of top-category tickets for matches in Brazil he knew were being offered at several times face value.
Lauber is investigating possible criminal mismanagement and money laundering in FIFA's business.
The case is widening to examine all aspects of FIFA's affairs after it was launched by FIFA's own criminal complaint last year about possible wrongdoing linked to the 2018-2022 World Cup bidding contests.
FIFA released Valcke from his job last Thursday hours after the allegations were made, and requested a formal investigation by the FIFA Ethics Committee.
Valcke likely faces sanctions even if financial corruption is not proven.
The FIFA code of ethics allows for charges of breach of confidentiality and loyalty, which could be leveled simply for doing official business through private email accounts.
Information from the Associated Press was used in this report.