I wonder if we might play Coutinho as part of the midfield three if Sturridge comes back, and Firmino as part of the attacking three either in a diamond or wide attacking 4-3-3 - so Benteke - Firmino - Sturridge for attack, and Henderson - Milner - Coutinho as midfield, with the option to put in Allen or Can in any of those slots, and Lucas in Milners position - the beauty of these pairings is that any of the midfield and attacking three (with exception to Lucas and Benteke) can switch positions and cover each others positions and still be deadly from there. Equally you can also change it up by replacing Firmino with Coutinho, Benteke with Ings, and we would play roughly the same way. If Sturridge is out (so start of season definitely) we can use both Firmino and Coutinho as part of the attacking trio, and potentially play a midfield of Henderson, Milner and Can, which would be one of the more impressive midfield a we've fielded over the past 3 years - pace, power, athleticism, and we know all of those three can play a bit as well.
I'm looking forwards to seeing how this season turns out- we thought we had a squad with depth last season, but we seem to have upgraded the quality somehqat this season, so this is, in my opinion, the strongest squad we've had in years, even if we are lacking the world class players of previous squads.