England insist Billy Vunipola remains on course for the Rugby World Cup despite undergoing further knee surgery.
The Saracens star has not played since damaging knee ligaments in April and a fortnight ago head coach Steve Borthwick spoke confidently about the number eight playing a full part in England’s warm-up matches in August.
But as the squad embarks today on its third of three mini camps prior to the announcement next week of the official tournament training squad, England have admitted Borthwick went back under the knife last Friday.
