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Former Wales scrum-half Richie Rees and ex-wing Shane Williams believe Wales should provide some selection continuity.
“What I wouldn’t do now is go chopping and changing over the next couple of weeks,” said Rees.
“So I would keep Sam at 10.”
Williams added: “If you said now that Sam has had his go, now we’re going with Dan, he [Costelow] is going to lose all that confidence he’s gained from the good things he did yesterday [against Japan].
“We can’t then say come back now against Australia and dominate again because I don’t care who you are, it affects your confidence.
“So I would not make any changes. They’ve got the job done with the bonus point win and I don’t think anyone played poorly, although there is a lot to work on.”
