The Sale flanker limped off in the second half of Saturday's 12-11 victory over South Africa and later left Twickenham on crutches.
The 34-year-old Australian overshadowed the gritty but flawed battle at Twickenham with his handling of English flyhalf Owen Farrell's shoulder charge on Bok centre Andre Esterhuizen.
Had Farrell been cited by commissioner Keith Brown, Farrell's availability for England's clash with New Zealand next weekend would have come under threat.
Elliot Daly landed England's other penalty from 50 metres, something he has consistently done for club side Wasps as Eddie Jones' men claimed back-to-back wins against the Springboks.
We're happy, they're (South Africa) not so happy. Nothing upset me about the tackle, we just have to latch on that if it is legal.
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Hosts win by 9 wickets, claim series 3-1
His partner in crime Kuldeep Yadav, who sits at No. 3, too earned good rewards for scalping nine wickets in the series. Mahendra Singh Dhoni is a beloved figure in the Indian cricket team and on Thursday, he proved yet again why.
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"Why is it always the most important game?" You're going to do it at some stage.
"If you watch at full speed, he has a big run up on me and we both bounce off each other and end up on the floor", Farrell said after the match.
England were again grateful for another stray delivery from Marx, but it was only a matter of time before the visitors regained the lead and it was Nkosi who scored the opening try in the corner after more excellent work from the dominant Springboks forwards.
England are looking for their first victory against the All Blacks since December 2012. "All the data shows that", Jones said.
"New Zealand's a different kettle of fish to the Springboks", said Jones, Australia's coach when they lost the 2003 World Cup final to England in Sydney and a consultant to the 2007 world champion Springboks.