Ireland and South Africa both have two wins from two at the World Cup ahead of this Saturday's Pool B showdown in Paris.
The Springboks have called out-half Handre Pollard into their squad.
Ireland had 43 points to spare over Tonga on Saturday, but Josh van der Flier knows the real tests come now
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Fiji shocked Australia with a 22 points to 15 win in Saint Etienne to leave Pool C wide open.
England earned their second win in Pool D by beating Japan 34-12 in Nice.
