The former England striker and his assistant Tony Grant went home to England in March when the season was suspended because of the Covid-19 outbreak.
And on Monday, the club confirmed that Fowler's time at the club had come to an end because of the "ongoing coronavirus situation".
"We are disappointed that the global pandemic has impacted our plans together but completely understand that family comes first during these difficult times," vice-chairman Chris Fong said in a statement.
"Robbie has not only provided stability but a refreshing injection of knowledge and insight into the Roar."
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