Tonga winger Sukanaivalu Hufanga has been suspended for five weeks after being found guilty of a dangerous tip tackle in his side's 19-14 victory over France in Wellington on Saturday.
Hufanga was yellow carded for the incident. He was cited by independent citing commissioner Steve Hinds of New Zealand following a review of video footage.
In a statement on Sunday, organisers said the judicial officer upheld the citing.
The offence was deemed to be mid-range, which has an entry point of six weeks.
However, mitigating factors and the absence of aggravating factors were taken into account and the player was suspended for a period of five weeks.
Hufanga had 48 hours to appeal. He will not be eligible to play again until 7 November.
Tonga's involvement at the Rugby World Cup ended on Saturday.