Taking the field in the 48th minute against Italy, Lomax and fellow reserve prop Tamaiti Williams immediately asserted themselves on the match.
Prop Ethan de Groot will miss the All Blacks’ decisive Rugby World Cup clash with Italy later this month after receiving a multi-game ban for a high tackle.
The incident was quickly deemed to meet the yellow card threshold by referee Luke Pearce, who opted for an off-field review.
With the August 28 deadline now passed for the final submission by all 20 teams of their 33-strong squads travelling to France, the names of the 660 players who will be involved at Rugby World Cup 2023 have been confirmed.
Picking themselves up following defeat to the All Blacks, South Africa took their frustrations out on an outclassed Namibia who couldn't live with Saturday's World Cup tempo in Toyota.