Russell Brand may have trouble getting through customs once he lands in New Zealand for his one-off show in November.
The British comedian has a historic drug conviction which saw him deported from Japan, and could mean he is denied access here.
A spokesman for Immigration New Zealand said there is never a guarantee that any visa application will be approved.
"Russell Brand will have to apply for a visa to enter New Zealand and make full disclosure of his previous convictions,” the spokesperson told the New Zealand Herald.
Brand was denied entry to Japan when his decade-old conviction surfaced.
Mike Tyson, who is also scheduled to appear at the Vector Arena days earlier, has yet to have his visa approved, Immigration NZ told media.
The former world heavyweight boxing champion is booked to speak at the Day of Champions event but his rape conviction may prevent him entering New Zealand.
"[We] can confirm that Mike Tyson has requested a special direction to enter New Zealand," the spokesperson said.
"His previous criminal convictions mean he is ineligible to be granted a visa unless he is given a special direction."