The next game for Newcastle will be key. If they win their home game against Dortmund, I would say that they have amost made it through the group stage unless they lose all of their last 3 games. I know there is still some speculation involved because the group is so close, but the team that has a head start in this close group is probably one of the teams that comes out successful. They have the goal advantage against PSG or they would have to get slaughtered. They have a home game against AC Milan and did not concede a goal there. They are in a great position to master the hardest group of this Champions League season.
However, because this victory makes Newcastle's chances of qualifying from the group much greater and also if we look at Newcastle's recent performance which is getting better, it makes many people believe that the Newcastle team will qualify from the group.
This big win over PSG is quite important for Newcastle players to be more confident in facing the next match because basically Newcastle is a team that is not the favorite, but they are able to prove themselves.
And PSG is really really down right now, even in the Legue 1 match the PSG team didn't play well, this team seems to have lost its identity this season.
I think a win adds to the confidence of a team all the time, but when a team realizes that it can beat PSG with a groundbreaking 4-1 that gives an extra portion of confidence not only for the Champions League, but also for the Premier League. I am still missing some new big names on the team of Newcastle United as I thought they would use the transfer window and buy some stars. Maybe not superstars, but players that have proven themselves in a strong league over some period of time. These players are doing well, but it couldn't hurt them to have one or two players that also bring a different aura to the team. But maybe that is what they exactly not want and they think it could hurt the cohesion.