Tommy O'Brien scores two of Ireland's seven tries in the victory over Fiji [Getty Images] With world champions South Africa next on the agenda, Ireland's Tommy O'Brien feels they must improve on the "clunky" win over Fiji on Saturday.

O'Brien crossed for two of his side's seven tries in the 43-15 win which moves Andy Farrell's side to within one point of France in the Northern hemisphere standings of the Nations Championship before next week's final round of games.

It was far from a vintage Irish performance with a number of errors halting their momentum, but they did manage to pull away in the second period.

Speaking to The Ireland Rugby…

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