Having failed to recover from a long-term knee injury, 2011 World Cup winner Israel Dagg has decided to hang up his boots.
Waisake Naholo suffered knee-ligament damage during Highlanders training on Monday, and he is expected to miss six weeks.
Ryan Crotty is the latest All Black who has decided to move to the Top League in Japan after this year's Rugby World Cup.
Half-back Aaron Smith is staying in New Zealand after re-signing with the Highlanders.
Kieran Read's return to action was cut short on Friday, but neither Sam Whitelock nor Scott Robertson seemed too concerned by the injury.
Kieran Read has not played this year, but the New Zealand captain is set to come up against the Hurricanes at the Westpac Stadium.
After presenting details of a new Nations Championship to major stakeholders, World Rugby announced its proposed plans.
A look back at the best facts and stats from Kieran Read's career, as he prepares to step down from New Zealand duty.
Kieran Read had been linked with Racing 92 and a Premiership switch, but said it was a "pretty straightforward" decision to move to Japan.
New Zealand head coach Steve Hansen says Kieran Read has enhanced the legacy of the All Blacks jersey in a "remarkable" career.
Kieran Read will head to Japan after the Rugby World Cup, ending his legendary career with New Zealand.
The Crusaders will not rush Kieran Read back in a Rugby World Cup year, meaning the All Blacks captain is facing another three weeks out.
World Rugby's proposed changed to the international calendar have not gone down well with top players.
Sonny Bill Williams' future is once again a major talking point and Toronto Wolfpack are willing to spend big to secure the cross-code star.
Liam Squire is leaving New Zealand at the end of the campaign to join NTT Docomo Red Hurricanes in Japan.
Scott Robertson had been tipped to take over with New Zealand when Steve Hansen steps down, but he has agreed a new deal with the Crusaders.