With half an hour still to play against the Wellington Phoenix, Perth Glory manager Kenny Lowe had just seen his table-topping team go 2-0 up against their opponents.
He turned to the defensive midfielder presumably to help shore up that lead.
But the 28-year-old, who has been capped three times by Australia and had unsuccessful spells at Queens Park Rangers, Notts County and Derby, was clearly in the wrong frame of mind.
Zadkovich came on moments after Perth went ahead and was off again just 17 seconds later, flying into a potential ankle-breaking challenge against Wellington's Vince Lia.
Rightly he was sent off after a huge protest by the opposition players, walking off with a wry smile.
Thankfully for Lowe, Perth held out with 10 men and managed to extend their lead at the top of the table to three points.
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