The Rugby Football Union said Karl Dickson of Harlequins will join the squad as a replacement.
The news is a huge blow for Youngs, who impressed by scoring two tries in Saturday's 36-27 second Test defeat in Johannesburg.
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Rugby
Youngs out of tour with shoulder injury
Posted on 18/06/2012 at 02:03, updated on 18/06/2012 at 02:07
England scrum-half Ben Youngs has been ruled out of the rest of the tour of South Africa with a shoulder injury.
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