Tadhg Furlong has been ruled out of Ireland's Six Nations opener against England next weekend.
The Leinster front row has a calf injury, and has been replaced in the squad by Connacht's Jack Aungier.
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Ulster suffered a shock 15-14 defeat to Zebre in the United Rugby Championship last night.
The visitors opened up a 15-nil lead and held on to claim a historic victory.
It's Zebre's first time to win a match in Belfast.
