Greater Western Sydney midfielder Toby Greene has apologised to his teammates and acknowledged he did the wrong thing after the club fined and suspended him for five matches for breaching their code of conduct.

Greene, 20, will face the Melbourne Magistrates Court on September 25 after being charged with several assault-based offences following an incident at a Melbourne nightspot on Monday night.

GWS stressed they were not prejudging anything that might happen regarding those charges.

Giants chief executive David Matthews said the punishments had been handed down because Greene had breached club protocols by drinking alcohol after sustaining an injury and failing to properly notify the club after he was charged by police.

The $5000 fine was the maximum allowed by the AFL under the circumstances, but the club stressed sacking Greene wasn't discussed.

The Giants board endorsed the recommendations of coach Leon Cameron and the leadership group of Callan Ward, Phil Davis, Stephen Gilham, Heath Shaw, Tom Scully and Shane Mumford to suspend Greene for five games and dock him $5000.

"Toby has put his hand up, he knows he's stuffed up," Ward said on Friday.

"We've got some strong protocols and strong rules here.

"He drank when he shouldn't have when he was injured; he didn't contact the club after he was in trouble.

"He's put his hand up and he's apologised to the group, he's extremely upset."

Outgoing AFL chief executive Andrew Demetriou backed the strong stance taken by the Giants.

"He'll have to face the charges and he's innocent until proven guilty, but from an AFL and club perspective it was unacceptable and he has apologised," Demetriou said on Fairfax Radio.

"We welcome the decision from the perspective that it sends a very clear message."

Cameron said it had been a tough few days for Greene, but backed him to rebound and said the punishments delivered a strong message about the culture GWS wanted to develop. AAP