Chiefs Rugby

The 37-year-old, a member of New Zealand's Rugby World Cup-winning squad in 2011, has this week joined the Chiefs as a replacement player.

The former Highlanders, Reds and Rebels loose forward played for Otago in last season's Mitre 10 Cup after a four-year stint in Japan with the Canon Eagles.

A Chiefs spokesperson told Stuff he was only signed on as All Blacks cover until early February at this stage, but said it was "highly likely" he would play in Friday's pre-season match against the Blues in Waihi. 

Polwart, 24, announced this morning he woun't take part in next year's Super Rugby season after deciding it wasn't worth the risk.

“It has been a difficult decision to make to leave the game I love," Polwart said.

"It has provided me with plenty of great friendships and some awesome experiences. I have had some on-going issues with concussion, and while I am currently symptom free, I chosen to hang up my boots and not to put myself at further risk.