For me in terms of senior players we need at least 2 senior players in each position currently the squad looks like this
GK: Walton
RB: Johnson, Clarke
LB: Davis (Johnson/Clarke can cover)
RCB: Woolfenden, Tuanzebe
LCB: Burgess, Edmundson
Johnson/Clarke can cover CB
RCDM: Morsy
LCDM: Luongo, Taylor
RW: Burns (think Clarke can play here)
CAM: Chaplin (Broadhead, Taylor, Al Hamadi can play here)
LF: Broadhead
Hutchinson can play across all 3 positions
ST: Hirst, Al Hamadi
I've left out Harness as do not think he's good enough, and all the players who were out on loan for us last season for similar reasons. Plus Humpreys as I don't think we should rely on someone who has so little experience, a loan move would do him good next season.
Looking at the squad there's probably quite few gaps ontop of the 2 we already have. I'm not adverse to getting a new CB but it looks the position we are best stocked with senior players who can all play at a decent level.
GK cover (I've actually liked what I've seen of Slicker) or more likely a first choice GK
LB cover
Need at least 1 CM
Good good options in the forward positions and a number of players who can play in different positions. I'd like at least 1 more in there though maybe a more Burns type player, hardworking, physical and direct either wide left or right, think we've got enough options of people in the team who can do a job in the 10 position (Chaplin, Broadhead, Hutchinson, Taylor, Al Hamidi). Think if we lose Burns we don't have anyone else like him and how he plays is crucial to the balance of the team, whilst different players if we lose Chaplin, Broadhead, Hutchinson we don't lose much in terms of quality if they interchange between each other.
At least 1 senior striker. I really liked the look of Al Hamadi last season but not sure he'd be able to start if Hirst got injured but actually as an impact sub I can't see why we wouldn't use him in the PL, him, Sarmeinto and Hutchinson coming on in games last season brought some great energy and they all were a major part of why we got promoted even of they were mainly substitutes.
So minimum on top of the 2 we've already brought in I'd say we need another 5 signings.