The reality that happened after the division of the group reversed from what they thought, Newcastle joined the group of hell which was inhabited by other strong clubs. PSG, AC Milan and Dortmund are not just any teams, Newcastle will have great difficulty getting into the round of 16 due to the very competitive competition in Group F.
Their group is actually a toughest among all Champions League groups. Even it was expected that Newcastle United will be fallen into a tough one, what they got is most terrible scenario.
However, will other clubs in that group mind much about Newcastle United? They know Newcastle United don't have experience there and can be a weakest opponent in the group, even they end in top four of Premier League last season. Newcastle United must accept this fact and use this season to learn and get experience, then move on.
Newcastle poor performance at the start of the season made their chances even smaller, they were only able to win 1 win and 3 defeats in the 4 matches they had played in the Premier League. The negative results obtained by Newcastle in the EPL make me doubt that Newcastle will be able to go further in the UCL, especially since their coach doesn't have enough experience in the UCL.
Even if they get good start in Premier League, they will still have difficulty in Champions League. With very poor performance in Premier League, Newcastle United will get more pressure when Champions League kicks-off.
Playing a first season in Champions League after many years will be big challenge for their players and coach. They will not have enough experience to play against clubs from other leagues with different tactical styles and have troubles to allocate their resources in this season. It's worse for Newcastle United when they fell into a toughest group in this season.