SOUTH Sydney chief executive Shane Richardson has condemned a section of the club's supporters following the unfurling of an offensive banner during last Friday's defeat by the Sydney Roosters in the minor premiership decider at ANZ Stadium.

A record crowd of 59,708 attended the game - the most for an NRL non-finals encounter - but as the teams ran onto the field a sign depicting the Roosters' logo with the words "Scum: forever in our shadow" written across it was held aloft.

"Friday night's blockbuster against the Roosters was outstandingly supported by our members and supporters and we would like to thank you for all for your encouragement and involvement on the night," Richardson said.

"However, there was a small group of so-called Rabbitohs supporters who took it upon themselves to create an offensive banner.

"The club would like to state that in no way do we condone the banner that was displayed, or any other derogatory messaging."

Richardson said the club is studying CCTV to find the perpetrators and if they are found to be members they will have their memberships revoked.

"The club encourages our members and supporters to create signs and banners that support our team and our players, rather than criticising the opposition," he said.

South Sydney co-owner Peter Holmes a Court also took exception to the post in a Facebook post.

"Love that the Rabbitohs broke a 105 year old attendance record, loved the blanketing of the stadium in red and green, love the passion of our incredible Members and Supporters," the wealthy businessman, who owns Souths with Hollywood superstar Russell Crowe, wrote in a Facebook post.

"Didn't love the final score, nor this banner. Rivarly, yes, hatred, sorry, never.

"Rooster fans may be misguided and delusional, yes, Scum, sorry, never.

"The world could do with less hate, and sport is best when it is used to build communities."

While the Roosters claimed this year's minor premiership and have enjoyed more success than their foundation rivals in the modern age of rugby league, South Sydney still leads the premiership count 20 to 12.

The Rabbitohs will open the finals against Melbourne on Friday, while the Roosters face Manly on Saturday. A Rabbitohs v Roosters grand final has been hotly anticipated, with both teams having been in outstanding form for the entire season.

As expected, the battle between Roosters superstar Sonny Bill Williams and Souths giant Sam Burgess provided plenty of highlights on Friday.