The Wallabies will be without vice-captain Michael Hooper for its final pool game, after the flanker pleaded guilty to a Foul Play charge on Tuesday.
Hooper was cited for a 39th minute clean out on England fullback Mike Brown, under Law 10.4, which relates to charging into a ruck or maul without using arms.
The flanker was penalized at the time but not yellow carded for the incident.
The judicial officer deemed the offence was on the lower-end, with a maximum two-week suspension but Hooper’s early admission and good behavioural record reduced that penalty to just the one week.
Hooper will be available for the Wallabies quarter-final, against any one of South Africa, Scotland or Japan depending on the results of this weekend’s games.
His suspension means one of Sean McMahon or Ben McCalman is likely to be upgraded into a starting spot for the Wallabies’ showdown with Wales.