Aaron Smith

The messages appear to show Smith had convinced the woman he was caught in an airport toilet with last year to lie in a legal document, had mislead his coach, and had attempted to deceive his partner.

On Thursday, New Zealand Rugby confirmed to Newshub based on the new information, it's planning to "investigate the Aaron Smith matter further".

"It is effectively an employment issue that requires investigation," the spokesperson said.

If genuine, the messages show Smith convincing the woman to lie in a legal document, misleading his coach and attempting to deceive his partner.

The All Blacks star allegedly had sex with the woman in a disabled toilet at Christchurch Airport in September 2016.

He claimed it was a one-off incident and apologised for his "huge error in judgement".

But the woman told the Daily Mail Australia that she was involved in an affair with Smith for two years.

Aaron Smith was handed a one-game suspension and faces a misconduct hearing after members of the public spotted him following a woman into a disabled toilet last month, while he and his All Blacks teammates were waiting at Christchurch airport.

"I've made a huge mistake, a huge error in judgment," the 27-year-old told reporters at the team's hotel in South Africa Thursday.

"I'd firstly like to say a huge sorry to my partner Teagan, her family, my family. I'm also sorry to my teammates, NZRU and the New Zealand fans.