Wallabies skipper George Gregan will miss Australia's next Rugby World Cup match with a corked thigh.

Gregan didn't return after halftime in Australia's 90-8 win over Romania in Brisbane and didn't attend the post-match press conference as he underwent treatment on the injury.

Australian coach Eddie Jones said the cork wasn't serious, but would rule him out of the clash with Namibia in Adelaide next Saturday.

Matt Giteau replaced Gregan at halftime, but Jones said regular reserve halfback Chris Whitaker would definitely start against Namibia after sitting out the latest match.

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