Manchester City, Chelsea, Newcastle and Brighton are still uncertain who will ultimately be ranked in the top 4 at the end of this season. But regarding Nottingham I feel they will really be able to maintain the top 3 ranking they currently occupy. Because even though the depth of their squad is ordinary, we know that the quality of their game is quite good this season, even strong teams are not able to beat them this season.
Nothing can be said for sure about Nottingham Forest yet. Nottingham Forest is in a somewhat safe zone. Nottingham Forest is 5 points ahead of Chelsea. However, if Nottingham Forest's performance is not stable in the upcoming matches, then they are likely to lose the third place in the table.
Chelsea, Manchester City, Brighton and Newcastle are all four teams trying to occupy the fourth place in the table. All four teams have the ability to qualify for the Champions League. Now the team that can play well in the upcoming matches will occupy the fourth place in the table. At the moment, the performance of Brighton players is more stable than Chelsea, Newcastle and Manchester City.