Inter made a ton of money last year with being cup winner if I am not wrong, ucl finals runner-up, and being in the top four of the league. When you combine all those together with the extra tickets being sold, and the extra merchandise being sold, and the money you make from winning those and tv rights and all that, the combined money they made is huge.
I criticized them heavily after they sold Lukaku after a great season but that didn't mean that it stopped them, they did very well anyway and I think they are doing a good job, Lukaku is back again as well but he is not really the way he used to be after the injury. Long story short they will have all the financial needs covered and will be able to make a profit when the time comes but first they will build a better squad too.
It's been a very good season for Inter, thanks in large part to a good performance in the Champions League. Whether they will be able to repeat their success in the next Champions League, to be honest, I doubt it, and I am also not sure that they will be able to compete for the Scudetto. In Serie A, they were too unstable, perhaps the reason was also that they gave a lot of strength to the Champions League, but they were not the only ones who had to play in several tournaments. If they really managed to make a good profit this season, then they will have the opportunity to strengthen the team, but I don’t see big transfers expected yet, the last one is Thuram from Borussia Mönchengladbach, and he will join the team as a free agent.