New Zealand lock Patrick Tuipulotu and centre Anton Lienert-Brown have been ruled out of the second test against Argentina after suffering head knocks in the opener in Cordoba, coach Scott Robertson confirmed on Tuesday.

Tuipulotu was taken to hospital and failed a head impact assessment after the All Blacks' 41-24 win last Saturday while Lienert-Brown had a late head-on-head clash with Santiago Chocobares which earned the New Zealander a yellow card.

Robertson's squad has cover in both positions, with Josh Lord a potential replacement at lock and former Fiji under-20 player Timoci Tavatavanawai a midfield option.

Robertson said loose forward Wallace Sititi and prop Tamaiti Williams should be available for selection for Saturday's second test in Buenos Aires after missing the Cordoba op

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