The absence of just one player is not enough to destroy the whole seasons for Newcastle United, i know that Isak is one stricter that made a difference for the club in previous seasons but at this point its difficult to tell what will happen if Newcastle will have him back in the club or not, but we should be ready to go with whatever the outcome for the club is since is obvious that Isak may not come back to Newcastle.
Players like Isak are still highly sought after by other teams, so he doesn't need to worry if Newcastle no longer accepts him. This means he can ask the club to sell him without causing further drama, as a striker like Isak is the type of forward who can help the team sharpen its attack. So, it would be very strange if Newcastle didn't take a player like him, whose attacking potential is clearly there, especially as the competition for trophies in the Premier League is set to be much tougher this season.