3 or 4 signings max
Will need a keeper, Johnstone or not.
A solid reliable partner for Chester at the back.
Someone with clear ownership of the midfield which will release Hourihane and take the pressure of Jedinak to play every week.
Grealish should be playing behind the front players somehow and although we probably have enough out wide in Green, Adomah, Amavi et al to make it work I'd probably bring in a wide man with quality.