Chelsea are very close to achieving Champions League qualification. They need to win their next game against Nottingham Forest because it might be a deciding game for the Champions League qualification campaign, it will be a really difficult game because Nottingham Forest are also in the race for the top 5.
Chelsea performed well in their previous game against Manchester United, and I'm wondering why Manchester United was unable to stop Chelsea from winning the match. Chelsea failed to beat them in their first match, and despite Manchester United poor performance under Ten Hag, it's a surprise they lost the second match. Many people expected Manchester United to play at the top because, even if they struggle against other teams, they can stop Chelsea from maintaining their position.
However, Chelsea on the other hand, has one game remaining to secure their Champions League ticket for next season, as you said, it will be tough for Chelsea to beat Nottingham Forest because Nottingham Forest is also fighting to qualify for the Champions League or any other European competition. Chelsea must win because a draw can cost them the next Champions League.
Entering the second half of the season, Manchester United even suffered defeats from mediocre teams quite often, so it is understandable why they also lost to Chelsea. Meanwhile, regarding Chelsea chances of securing a ticket to the Champions League, I think they will succeed even though their next opponent is not easy, namely Nottingham Forest. In addition, Newcastle, Aston Villa, Manchester City will also fight for the same thing, and the last match will determine who has the right to qualify for the Champions League next season.