The fight involved approximately 40 people who were watching the match at the Merrylands RSL at about 9.30pm last night.
Videos posted online show chairs and other objects being thrown.
A man is also seen lying on the ground after having what appears to be a plate smashed over his head.
Officers and other emergency personnel arrived shortly after. They say four people sustained non-life-threatening injuries. Three were taken to Westmead Hospital and one to Auburn Hospital.
Detectives are reviewing CCTV footage from inside the club.
No arrests have yet been made.
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