4. Joel Kpoku (Unknown)
Previously heavily linked with a move to Northampton Saints by the The Rugby Paper, it has been suggested that the 21-year-old could yet make a short-term move to the Gallagher Premiership. London Irish are thought to be the favourites to land the lock on what could be a three-month loan.
A mainstay in the England Under-20s side, Kpoku made his international bow against the Junior Springboks and has since represented his country at two U20 World Rugby Championships.
The powerful forward was also called up to a full England training camp in August 2018.