Don't think we will be playing a settled midfield/attack this season.
We will have the option to play two different formations depending on available personnel or opposition.
We can go with 4-3-2-1 similar to the end of last season.
McGregor
Goldson
Katic
Tavernier
Flanagan
Davis
Kamara
Jack
Aribo
Arfield
Defoe
Alternatively we can go 4-3-3 with two wide men
McGregor
Goldson
Katic
Tavernier
Barisic
Jack
Kamara
Aribo
Candeias
Jones
Morelos
In addition to these two choices we obviously have the opportunity to rotate the midfield (Kamara, Jack and Davis) and the wide men (Jones, Ojo, Hastie, Murphy, Candeias).
Aside from the left back position I don't think we have anything to worry about with all the names above.