Its a difficult balance really - everyone fit, we have the resources to play seven batsmen, two all rounders and six bowlers.
Even then, we have been two top five batsmen light for some time now. And everyone isn't fit. So replacements are probably required, as is a rethink about the balance of the side.
I wouldn't risk Broad, so I reckon we have two "injury" replacements required, minumum, and I would be brave and bring three even if Woakes and Zafar are a possibility for the last game, using the argument that if it isn't working there is no harm making changes. All that we joked about Australia "doing a 90s England" there is something to be said for action.
So, in terms of certainties, we have:
Cook
Root
Ali
Bairstow
Stokes
Buttler (be harsh to drop him and he showed something first time round)
Rashid
Anderson
In the squad, we also have Ballance, Duckett, Ball and Finn.
We certainly need someone to open, and I would like to see one more top order player brought over. Contenders? Jennings, Gubbins, Bell-Drummond, Lyth, Robson, Westley, Stoneman, Borthwick, Hales, Roy, Billings with the bat. If we bring another bowler, I would look at either Bresnan, a good all round option who bowls reverse and cut well, or take a punt on Sam Curran - it'd be an experience for him if nowt else.
What would I do? At the risk of critique, my side would be:
Cook
Westley
Root
Bairstow
Roy
Stokes
Ali
Buttler
Rashid
Anderson
Ball
I am not saying that Roy and Westley are the best players - long term I'm pro-Duckett - but the former is a good attacking option and a practical dead rubber is as good a chance as any to see how he suits the five day game. Westley....it'll be intriguing to see him kn division one next year, but his decent off spin adds another bowling option and covers for the loss of a notional bowling resource.