Wednesday is D-Day for Football Federation Australia as the governing body comes face-to-face with their biggest adversaries: A-League chairmen and active fans.

In what rates among the most important 24 hours in A-League's recent history, the FFA will be steeling itself for a brutal grilling from two of the sport's key stakeholders.

Both the men in suits and fans from the stands will come armed with a suite of complaints and it promises be an enormous test of will for new FFA chairman Steven Lowy and the chief executive David Gallop.

The meeting between the FFA and the A-League chairmen is a scheduled part of their ongoing dialogue but the roundtable with the active fan leaders is an unlikely, extraordinary development.