Fifa and its president Gianni Infantino have been accused of breaking trust "through deception" in an open letter issued by Uefa, Concacaf and the Asian Football Confederation.

The letter, signed by the presidents and general secretaries, said recent controversy over the Fifa Forward Enterprise (FFE) proposal was fundamentally about "the integrity of the game, and the integrity of those elected to lead it".

FFE would have meant a new company being created to manage commercial and ticketing rights of all Fifa competitions, including the World Cups, with 21% sold off to a private investment company.

It was aborted after widespread criticism from several confederations, led by Uefa which has threatened a boycott of all Fifa competitions.

"When trust is broken through deception, when an individual places himself above the collective that entrusted him with authority, that duty has been abandoned," the letter read.

It added: "Leadership in football is not a possession. It is not about holding - or demanding - power to be held. It is a duty of service to the football family that entrusts it."

While the statement did not name Infantino, sources have told BBC Sport that it should be seen as an opportunity for him to resign and leave his position with dignity.

It comes after Fifa issued a statement on Saturday evening which strongly criticised a "concerted and ongoing effort" to "undermine" the organisation and Infantino.

The three confederations - representing Europe, North America, Central America and the Caribbean, and Asia - criticised a statement released by Fifa after Infantino called management board members to a meeting in Rabat, Morocco last Wednesday.

The open letter added that Fifa's admission of mistakes made in the FFE process did not go far enough.

"It did not acknowledge that the proposal itself was inherently wrong," the letter stated. "There remains no recognition that attempting to sell an interest in the Fifa World Cup was a profound failure of judgement.

"Not just a procedural misstep, but a fundamental breach of trust with the very institutions Fifa exists to serve."

Fifa has committed to presenting a report to the next meeting of the Fifa council, which is expected to take place in October.

But the three confederations said this failed to "recognise that proper governance in the face of such a profound lack of judgement would require that such a review be conducted by a fully independent third party".

The letter underlined a legal warning made by Uefa that Fifa should not delete or destroy any documents related to the plans.

This is a potentially significant development.

According to sources close to the rebellion against Infantino, they are now sending him a clear message: resign now and leave your position with dignity, rather than seek re-election in March.

Alongside this joint statement, I am told the three confederations have begun preliminary discussions about organising competitions among themselves, so that players can still compete even if there is a boycott of Fifa tournaments such as next month's U20 Women's World Cup.

Since this crisis began, Asia has been seen as a key battleground, a region that could determine whether Infantino stays in power.

Some of the 46 countries in this vast region (eg. UAE, Qatar, Kuwait, Philippines and Sri Lanka), have said they still support Infantino. But the fact that the AFC president Sheikh Salman has signed off this letter suggests he is confident that there are plenty of others who want change.

Infantino still retains the support of South America, Africa, and indeed Mexico within Concacaf.

But this latest move ramps up the pressure once again in world football's unprecedented civil war.