Extra transport services are being put on to handle a large influx of visitors in Auckland this weekend.

More than 90,000 are expected at the NRL Nines event over the next two days.

Auckland Transport's John Stawbridge says some services will be free for people with tickets.

"A lot of options for people to get to and from the venue in this fabulous partnership with Duco."

Extra bus services will run from the suburbs, and additional trains will operate back to the central city after games.