Newcastle United hasn't compete for participating in UEFA Champion League and become bad participants of Premier League teams such as Manchester City and Arsenal who have one close forward to next round. Have top performed in domestic league can't guarantee with Newcastle have good performed in Champion League, its not only with Newcastle but also another Premier League teams participants in UEFA Champion League is Manchester United have poor performance.
Will be bad result for the first time Premier League teams can't qualify to 16 round with usually every season participants in Champion League always have four teams will qualify to 16th round. But have two matches left for Newcastle United and waiting today Manchester United match will give opportunity to make four teams of Premier League teams will be in 16th round or not?
Newcastle still has a big chance of getting through the group phase but it must also be understood that Newcastle's group F is joined by a strong team, so if they can't qualify I don't think it's a big surprise and also Newcastle is a team that has just improved this season. So, their mentality on the European stage is still weak.
On the other hand, Manchester United is currently in a slump. I think Manchester United's chances of getting through the group phase are very small, with their performance not improving, making them difficult even though they are facing a team whose quality is still below Manchester United.