Regulators are taking action against an NHS clinic in Hertfordshire, run by a private company, after inspectors found patients were still at risk and facing long waits for surgery.
Hook will undergo his surgery after facing the Springboks and Newport Gwent Dragon Will Harries has been called into the squad to replace wing Williams who also has shoulder problems.
Pryce is facing a three-month lay-off with neck surgery, while Eastmond has been ruled out of Friday's game after aggravating a hip injury in Saturday's 40-30 win over Castleford.
We are very grateful to all the doctors who volunteered their time and to Facing the World for organising all the logistics and for paying for the surgery.
David Dunaway, from the plastic surgery and craniofacial unit at Great Ormond Street, was the lead clinician and is also a trustee of Facing the World.