A NRL sideline interchange official has been taken to hospital with a suspected broken shoulder after being struck by a bottle by Canterbury fans as the Good Friday showdown with South Sydney ended amid ugly scenes at Sydney's Olympic stadium.

A last-gasp penalty from Bryson Goodwin in front of the posts sealed a dramatic and unlikely 18-17 win for the Rabbitohs.

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So incensed was Canterbury by the decision after James Graham caught the leg of Adam Reynolds as he tried to charge down a field goal attempt in the final minute that prop David Klemmer was sin-binned for verbally abusing referee Gerard Sutton.

After the final siren the officials were showered with plastic water bottles by a section of the crowd as they walked up the tunnel, with Darren Alchin slipping and injuring his shoulder as he hit the ground.

Canterbury chief executive Raelene Castle said the club would view CCTV to weed out the culprits and vowed to ban them for life.

"It's not what this club is about and it's not acceptable behaviour," Castle said.

"We will look at the vision and take action."

The Nine Network also reported that there was a coward punch attack outside the stadium after the game.

Hasler apologises for fan behaviour

Disgraceful scenes ... Canterbury fans were livid with officials at full-time. ( AAP: Mick Tsikas )

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Canterbury coach Des Hasler apologised for the actions of some of his club's supporters, and said despite his frustration at the defeat, the behaviour was not acceptable.

"I just want to offer an apology on behalf of the club," Hasler said.

"I've been to see the refereeing official who was I think struck by a projectile — he's OK but that is not us, that is not what this club is about and it's not what sport in this country is about.

"Unfortunately the behaviour of a few can kind of ruin it and spoil it for everybody.

"On behalf of all the officials and the players and everybody involved with the club, our sincerest apologies for what appeared and it won't happen again."

AAP