Cronulla halfback Brett Seymour made a public apology for the drunken behaviour that earned him a two-match ban before the NRL match between the Sharks and Newcastle on Monday night.

In a highly unusual move, Seymour took the microphone 20 minutes before kick-off at Toyota Stadium to say sorry for a wild night out which ended in the early hours of last Monday morning.

Seymour, 24, was stood down for two games by the Sharks and fined $20,000 on Thursday.

"I'd just like to apologise to all the sponsors, all the fans out here, my family and my girlfriend especially," he said.

"This has been a tough week for all the wrong reasons and I'm just looking forward to getting back on the paddock in a couple of weeks and repaying the faith of you guys.

"It's going to be the toughest part, just watching my mates run around and not being a part of it."

Seymour, who was sacked by Brisbane in 2006 after another off-field incident, was caught on a mobile phone video camera staggering around Cronulla Mall and falling to the ground with a woman.

Seymour was replaced by Blake Green at halfback for the Monday night football match.

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