Rugby legend Sir Colin Meads called up a radio station to win Justin Bieber tickets for his granddaughter this morning.

It's the first time Sir Colin has spoken in public since being diagnosed with pancreatic cancer in August.

ZM radio hosts Carl 'Fletch' Fletcher, Vaughan Smith and Megan Sellers were left gasping when they realised who they had on the line.

SUPPLIED Justin Bieber is performing one New Zealand show at Mt Smart Stadium next March - and Sir Colin Meads' granddaughter Abbe will be there.

The call came as part of a ZM segment called 'The Fame Game' in which listeners try to get the most famous person they know to ring the station.

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"I'm Colin Meads and I've got a granddaughter that wants to go and see Justin Bieber," Sir Colin told the stunned hosts when they asked who he was.

"She's me granddaughter Abbe is, and a very nice one at that."

"Do you know who Justin Bieber is?" asked Sellers.

"I know, I've seen him singing, yes," responded Sir Colin. "I do know Justin Bieber - not personally, but I've seen him on TV."

Any Bieber fans attending the concert next March shouldn't waste their time attempting to spot the legendary All Black while they're there however - Sir Colin won't be joining his granddaughter at the concert.

"I'm not well enough to but no doubt she'll be taking her boyfriend or her mother or her sister or I don't know who," he said.