Livaja already is going to spend next season at Atalanta. That's already set in stone, unless we decide to break his co-ownership (which will only happen if he scores like 15 goals before the end of the season)
Longo would be retarded to stay at Inter next season. He should move to a team where he will start week in week out - no matter what level. I'd rather he played Serie B, 38 matches, and scored like 40 goals, than La Liga, playing 10 matches and scoring 2. In terms of experience and profile it'd be better.
So, really, our forwards next year will be Icardi, Palacio, Cassano, Milito, and +1 wide player (like Markovic or Weiss)