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Players are involved in a push and shove after a player is fouled during the FFA Cup Round of 16 match between Lions FC and Perth Glory at Perry Park. (Photo by Bradley Kanaris/Getty Images)

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Fans in the crowd let off flares during the FFA Cup Round of 16 match between Heidelberg United and Sydney United 58. (Photo by Scott Barbour/Getty Images)

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Daniel Heffernan of Heidelberg United celebrates with his teammates after scoring the first goal during the FFA Cup Round of 16 match between Heidelberg United and Sydney United 58 FC. (Photo by Scott Barbour/Getty Images)

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Harry Novillo of Melbourne City celebrates after scoring a goal during the FFA Cup Round of 16 match between Melbourne City FC and Wellington Phoenix at AAMI Park. (Photo by Robert Cianflone/Getty Images)

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Rhyan Grant of Sydney reacts after scoring a goal during the FFA Cup Round of 16 match between Adelaide United and Sydney FC at Coopers Stadium. (Photo by Daniel Kalisz/Getty Images)

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United players celebrate after scoring a goal in extra time during the FFA Cup Round of 16 match between Adelaide United and Sydney FC. (Photo by Daniel Kalisz/Getty Images)

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Matthew Jurman of Sydney reacts to Mate Dugandic of United during the FFA Cup Round of 16 match between Adelaide United and Sydney FC. (Photo by Daniel Kalisz/Getty Images)

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Mirjan Pavlovic of Oakleigh Cannons is congratulated by teammates after he scored a goal during the FFA Cup Round of 16 match between MetroStars and Oakleigh Cannons at Elite Systems Football Centre. (Photo by Morne de Klerk/Getty Images)

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Marcus Schroen of Hume City celebrates after scoring a goal during the FFA Cup Round of 16 match between Hume City and Sydney Olympic at ABD Stadium. (Photo by Scott Barbour/Getty Images)

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Dimas Delgado of the Wanderers celebrates a goal during the FFA Cup Round of 16 match between Palm Beach Sharks and Western Sydney Wanderers. (Photo by Chris Hyde/Getty Images)

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Players look on as the sprinklers are turned on during the FFA Cup Round of 16 match between Palm Beach Sharks and Western Sydney Wanderers at Cbus Super Stadium, Gold Coast. (Photo by Chris Hyde/Getty Images)

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Marko Jesic of the Suns scores a goal past Danny Vukovic of the Victory from the penalty spot during the FFA Cup Round of 16 match between Rockdale City Suns and Melbourne Victory. (Photo by Mark Kolbe/Getty Images)

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The Suns supporters wave a supporter flag as smoke from a flare clears. (Photo by Mark Kolbe/Getty Images)

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Daniel Georgievski of the Victory argues with referee Katie Patterson during the FFA Cup Round of 16 match between Rockdale City Suns and Melbourne Victory at WIN Jubilee, Sydney. (Photo by Mark Kolbe/Getty Images)

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Danny Vukovic of the Victory kicks away a smoke flame thrown onto the pitch. (Photo by Mark Kolbe/Getty Images)

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Hristijan Tanoski of the Suns reacts after a missed chance as Idriss EL Hafiane of the Suns watches on during the FFA Cup Round of 16 match between Rockdale City Suns and Melbourne Victory. (Photo by Mark Kolbe/Getty Images)