There's talk that Ethan Walker is coming back here:
https://footballleagueworld.co.uk/sources-preston-north-end-set-to-allow-player-to-join-efl-side-once-again/.
It would seem excessive to have Zanzala, Patrick, Toure, Alessandra, Kayode, Dickenson, Scott AND Walker, unless somebody is leaving or long-term injured. That would be eight players competing for three places, plus the likes of Bell coming through as well. The only way it would be needed is if Kayode is going elsewhere or Toure decides to go back to France.