England look set to be without Billy Vunipola for the Six Nations after the Saracens number eight suffered a broken arm against the Ospreys on Saturday.
The back-row only returned from a three-month spell on the sidelines with a knee injury in the Premiership victory against Wasps last weekend and suffered another cruel setback at the Liberty Stadium.
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Vunipola was replaced at half-time in the Champions Cup clash, which ended 15-15, and Saracens on Sunday revealed that an X-ray showed Vunipola had fractured his forearm, just three weeks before England start the defence of their Six Nations title against Italy in Rome.
"Billy is due to see a specialist later this week, when a timeframe for recovery may be defined," said a Saracens spokesman.
"But until that time Saracens will make no further comment. Saracens will issue a further statement once Billy has seen a specialist."
