Cape Town: South African fast bowler Dale Steyn left the field with a bruised left heel on Saturday, the second day of his first Test match in more than a year.
Olivier has played five Tests - all of them in 2017 - and Ngidi made his worldwide debut in a T20I against Sri Lanka a year ago but is yet to play the other two formats at the global stage.
The 34-years-old pacer made a comeback in the first Test against India after a 13-month break, but unfortunately he got injured again.He grabbed 2 important wickets in the match against India. A decision on whether he would bat hadn't yet been made.
Steyn pulled up three balls into his 18th over after taking two for 51 in the first Test against India at Newlands. He needs another three wickets to overtake Shaun Pollock and become South Africa's leading wicket-taker of all time in test cricket.
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The report also states that Steyn could be even out for 4-6 weeks, and possibly out of series. After that Steyn went for scans where the extent of his injury was revealed.
"Generally you need rest", Moosajee said, saying there was "significant" bruising and tissue damage on Steyn's foot.
Commenting on the additions, Proteas coach Ottis Gibson said: "We have to replace Dale who has picked up an unfortunate injury". "Just feeling very sympathetic for him". He had only played eight tests in three years before his return this week. Now he will not play in this match.
Moosajee said the latest setback had nothing to do with his injury history or workload in the match.