The squad has been bolstered by the return of players who spent time away from the club, on a temporary basis, ahead of the start of pre-season training next week.
Dean Henderson was the first-choice keeper at Nottingham Forest, before picking up an injury that unfortunately cut short his campaign, while Matej Kovar won the Czech top-flight with Sparta Prague.
Defenders Eric Bailly (Marseille), Alvaro Fernandez (Preston North End), Ethan Laird (QPR) and Alex Telles (Sevilla) have all seen their loans end, while Di'Shon Bernard (Portsmouth) and Axel Tuanzebe (Stoke City) have been released in order to join new clubs after their moves elsewhere.