The Sky Blues and Wanderers have never met before in the FFA Cup, meaning it will be an historic occasion.

The other encounter sees Bentleigh Greens - narrow 1-0 winners over Heidelberg United on Wednesday night - take on Adelaide United for a place in the decider.

The matches will be played on Friday 5 October and Saturday 6 October, with Penrith Stadium and Kingston Heath the likely venues.

In a quirky substory, Bentleigh players had planned to fly out for their end-of-season trip to Bali on Saturday 6 October.

FFA Cup Semi-Finals:
Western Sydney Wanderers v Sydney FC
Bentleigh Greens v Adelaide United