With four players leaving and only one in where they're actually needed the lack of signings is definitely worry. Particularly as rivals are strengthening there squads with good depth.
The squad is worryingly thin. Assume a centre half will come in as putting Beattie there means Walsh will be in a midfield three with Scott and Christiansen, but an injury/suspension to any of those means centre half will need to be filled and the support players are not of sufficient quality. The same of the forwards depth needed too, Stanway is there but can you really rely on a 16 year old for back and consistency? Chelsea look miles in front. Arsenal strengthened a lot. Surely more is needed naïve to go in with a squad of 18.
Two in, not one. Also, I suspect that you are going to see Melbourne City loan a couple of their players back to England as soon as their season ends next weekend.