The centre has a recurrence of a groin injury that rules him out.
Ulster's Stuart McCloskey will not take part in the squads clash against South Africa this weekend.
The centre has a recurrence of a groin injury that rules him out.
Ireland Head Coach Andy Farrell has confirmed that Garry Ringrose and Josh Van Der Flier will return to full training this week and Thomas Clarkson has passed HIA protocols after a head knock against Australia on Saturday.

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