So often the joker, Ali Williams revealed an emotional side as he announced his retirement from international rugby after 77 All Blacks Tests.

World-class lock Williams broke down at a press conference on Friday as he explained his reasons for ending a career which began against England in 2002 and finished against Italy in Rome last November.

“It’s pretty hard but you’ve got to make tough calls. I just look back at how much fun I’ve had,” Williams said.

“I’ve had a special time in the jersey but I believe in my gut that the time’s right now.”

Williams, 32, was consoled by All Blacks coach Steve Hansen as he wiped away tears.

Hansen said Williams’ penchant for irreverent humour was well known but didn’t capture the essence of a player who wore his heart on his sleeve and is hugely respected by teammates.

“Ali’s been painted by a lot of people as a joker and a bit of a funny man. But that’s not the real Ali,” said Hansen.

“Deep down he cares a lot and you can see that at the moment.”

Williams appeared in three World Cups and was part of New Zealand’s win over France in the 2011 final at Eden Park.

Hansen paid tribute to Williams for putting the team first.

“He knew he may have been selected for the All Blacks again this year,” he said.

“But he also knows that it is better for the team to have a younger player in the position.”

Williams was at his playing peak from 2005-08 before major achilles injuries which required three operations affected his career.

His All Blacks role from 2011 was largely to support the next wave of locks and Hansen says his influence there shouldn’t be underestimated.

Williams became well-known for his flamboyant versions of the haka and he revealed the traditional pre-Test challenge was playing on his mind before his debut at Twickenham.

“I remember it, because I thought `how the hell am I going to do the haka’,” he said.

“A bit of quality time in front of the mirror, I got the actions down pat. Some people say I should still do it in front of the mirror.”

Williams says he is enjoying the challenge of captaining the Blues in their vastly improved Super Rugby campaign this season and intends to play for them beyond this year.

Blues coach Sir John Kirwan says Williams will be remembered as “one of the greats” for New Zealand.

“I’m probably the happiest man here because I get to profit. He’s been outstanding for the Blues and he wants us to get back to where we should be,” Kirwan said.