Group F is certainly the most interesting in this Champions League group stage match. Almost all of them actually have the potential to qualify. Milan is showing good performance in the Ligue 1 they are not performing well in the Champions League competition. Who knows, maybe they will be able to improve their performance in the Champions League, it is really uncertain which teams are actually going to qualify. The only team that I am confident about qualifying is actually PSG and trust me I really hate saying this.
there is a slight mistake in your writing that Milan is not in League 1 but in Series A. 
the best candidate might mostly say PSG because currently PSG is leading group F but if you always watch UCL matches when group F competes you will definitely say Newcastle or Dortmund are also still worthy of qualifying from this round because almost all the teams in group F have performance which is pretty good except Milan are without a win since the preliminary round started. you can also see how PSG was completely beaten by Newcastle but after that Newcastle was beaten by Dortmund after that Dortmund was beaten by PSG, very interesting? yes, of course, because it is too early to determine who will qualify from Group F because there are still several matches remaining while these three teams are still a very competitive competition.