The Highlanders' impressive win over the Kings in Port Elizabeth has proved costly with four players returning home due to injury.
According to a Fairfax Media report, Shane Christie, Liam Squire, Marty Banks and Daniel Lienert-Brown will all miss the final leg of the champions' tour to Buenos Aires, where they face the Jaguares.
Openside flanker Christie, who returned to action from a hamstring injury sustained in April, was forced off the field at half-time in the 48-18 win against the Kings as he was feeling unwell.
New All Blacks back-row Squire came on as a second-half replacement but suffered a head knock shortly afterwards and will now undergo concussion protocols.
Fly-half Banks was set to start at fly-half but strained a hamstring during the captain's run in Port Elizabeth and returned to Dunedin before Saturday's clash.
And front-row Lienert-Brown had to leave the field in the first-half with a knee injury.
The Highlanders will though be boosted by the return of All Black stalwarts Ben and Aaron Smith, Waisake Naholo and Malakai Fekitoa, who join the squad in Buenos Aires.
Back-row James Lentjes and prop Craig Millar have also been added to the squad as injury cover.