England's final group game against Tonga on Friday is a winner-takes-all clash for a place as Pool A runners-up, and a likely quarter-final against Australia in Marseille on 6 October.
Sarries chief executive Edward Griffiths says the prop's new deal is illegal and irrelevant and has taken up Tonga'uiha's U-turn with the governing body of the Guinness Premiership, who have now asked for written reports from both clubs.