K.I., I agree with you. If it was said in the sense of "we" as a team then I do not have any problem with and neither should Brozovic. However, if Lukaku was singling out players that is another thing altogether.
InterFCAustin, I do not agree with your post. The fact that Lukaku just arrived at Inter should not make any difference. What you are essentially saying is that Lukaku does not have any standing in the squad because he only just got here and he should simply shut his mouth and play football. Given that the games are coming thick and fast with little time to train in between, players need to work through and learn on the on the pitch during games rather than in training.
There is nothing wrong with a player trying to direct and explain the best way to serve him and thus help the team. Lukaku (or any other squad member) staying quiet does not help the players learn about how all of the parts of the machine play and work together to contribute as a whole.