"We're providing them with the knowledge of Maori tikanga and being there to support them about things on the marae," he said.
Although a staunch All Blacks supporter, he was happy to be part of the welcoming for Australia and Ireland.
"They're guests to our country so it doesn't bother me - but when it comes to the games they're back to being the enemy."
Mr Biddle will accompany the All Blacks on Saturday at Auckland's Aotea Square, will then fly to Queenstown to welcome the Irish team and then back to Auckland to welcome the Australians.
He will finish his Rugby World Cup involvement by being part of a marae welcome for the Romanian rugby team in Invercargill.