It really depends on what we are going to do this summer's transfer window. We just need that one extra top quality player for the front 3, ideally still keep six players for three positions.
So in effect, if we consider Mane, Salah, and Firmino to be locks, which we have to, then the remaining three slots will probably go to:
a) Said player that will complement the front three. I don't see anyone in our squad that can at the moment, it will have to come from a transfer of some sort.
b) One of Lallana or Oxlade-Chamberlain to fill in. Both are suited as cover on the LF or RF roles as senior members of the squad.
c) Solanke probably has one of the slots if he stays. If he does go on loan, probably Ings will take his place. I believe they are in direct competition to each other. Brewster may get a slow introduction to first team life, and honestly, I think Wilson's time here may be up.
I just don't see how both Solanke and Ings will fit into our squad together next season. There just won't be enough game time for both of them, and they would just be taking up space on the 25 man roster. Going by what has transpired lately, I'd be willing to bet on Ings to be honest, because for some reason Solanke's been ignored for the most part the last few games, even though there was ample opportunity for him to play.