Ben Smith

The 84-times capped New Zealand back was shown a red for leading with the elbow into contact, and was duly sent from the field by referee Alexandre Ruiz.

The collision in the 51st minute left Stade hooker Lucas Da Silva on the floor and needing medical assistance.

The sending off would prove costly for Pau, who despite a late try for Lucas Rey, ran out 21 – 18 losers to their Parisian hosts.

It’s far from an ideal start to Smith time in France, arriving in the French league following an illustrious and storied career in the sport to date.

In a potential changing of the guard five weeks out from the Rugby World Cup, coach Steve Hansen has introduced young flyers Sevu Reece and George Bridge to the wing for Saturday's winner-takes-all Test.

Nepo Laulala claims Franks' tighthead berth in one of five starting changes from the team humbled 47-26 by the Wallabies in Perth.

Two changes were forced.

Veteran Sonny Bill Williams returns to the midfield following injury to Jack Goodhue, pushing Anton Lienert-Brown to centre, while fourth-choice lock Patrick Tuipulotu replaces the suspended Scott Barrett.

Smith will start at fullback after recovering from a hamstring strain which has kept him out for seven weeks.

He was expected to return last week against the Waratahs, but the Highlanders decided to give him extra time to recover.

The co-captain is one of just three changes to the Highlanders lineup with Sio Tomkinson replacing Tevita Li on the left wing.

Smith suffered the injury in the Highlanders draw against the Chiefs in Dunedin at the weekend.

His injury raises concern in the All Black camp too with utility back Damian McKenzie already ruled out of the World Cup with a serious knee injury.

Highlanders assistant coach Glen Delaney says they're getting used to operating without key players.

"We've had guys dropping out throughout the year (through injury). We lost Aaron Smith for a bit, we had Liam (Squire) out for a bit and Waisake (Naholo's been out for a bit," said Delaney.

Smith, who has started at fullback all season, replaces Waisake Naholo in the number 14 jersey, with his fellow All Black being rested.

Smith is replaced at fullback by utility Fletcher Smith.

Tyrel Lomax will start at tighthead prop with regular tighthead, Siate Tokolahi, having been ruled out for six weeks with a knee injury.

Aaron Smith returns to the starting lineup.

Liam Coltman replaces Ash Dixon at hooker and Elliott Dixon starts on the blindside.

Veteran All Blacks lock Sam Whitelock might be in line for a lift in leadership now the vice-captaincy role is vacant after Ben Smith started his sabbatical.

Whitelock, 28, who could play his 91st test if selected for Saturday night's test against Argentina in New Plymouth, impressed most observers with the way he handled the captaincy of the Crusaders through their Super Rugby triumph this season and appears the natural back-up to Kieran Read.     

The fact Ben Smith still wants to play test rugby when his sabbatical expires might have had something to do with his reluctance to comment on Steve Hansen's acting career.

All Blacks coach Hansen is set to star in an advertisement for biscuits, where he appears dressed in leathers and riding a two-wheeled machine, evoking some mirth among his players.

Smith hasn't played since leaving the field during the first test between the All Blacks and British and Irish Lions last month.

The 31-year-old was thought to have suffered a third concussion this year, only for All Blacks coach Steve Hansen to reveal on Thursday it wasn't concussion, but rather an inner-ear problem hindering the Otago product.

Smith won't feature in the series deciding test against the Lions on Saturday night, but the All Blacks vice-captain is in Auckland helping the team prepare for the fixture. 

Smith suffered his third concussion since February - and sixth in the past five years -  during the All Blacks' 30-15 win against the British and Irish Lions in Auckland on Saturday night. 

Fulcher, an Auckland-based sport and exercise physician for Axis Sports Medicine Specialists, said the frequency of Smith's injuries were "concerning", and he would discuss retirement or a break from the game if he were to sit down with the 31-year-old. 

Smith was a late scratching for the Highlanders last weekend after suffering a hamstring strain during the warmups.

He had previously missed two games with concussion.

Squire has been out of action since suffering a knee injury in the second round in early March.

Preparing for what will no doubt be a physical encounter coach Tony Brown has restored Daniel Lienert-Brown, Siosuia Halanukonuka, Alex Ainley and Elliot Dixon to the starting eight.

Squire makes his return after four weeks on the sideline and will make an impact from the bench.