Aaron Smith

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.

Smith will this week celebrate playing his 100th Super Rugby game for the Highlanders when they take on the Melbourne Rebels in Dunedin.

He received a formal warning and stood down from an All Blacks test in October after he was seen entering a toilet cubical with a woman at Christchurch Airport.

He later said he made a huge mistake and apologised to his partner, both his and her families, his teammates and New Zealand fans.

Smith struggled on the All Blacks end of year tour.

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.

Yesterday the team's coach, Steve Hansen, said Smith was seen entering a toilet cubicle with a female friend at Christchurch Airport the day after the test against the Springboks last month.

RNZ reports Hansen said Smith had been suspended for one test for breaking the team's behaviour protocol.

Speaking to the media from the All Blacks' hotel in Durban, Smith said he had made a huge mistake and it was an error in judgement.

He also apologised to his partner, Teagan Voykovich, both his and her families, his team-mates and New Zealand fans.