PSG are undergoing a rebuild and it is only normal to have shocking embarrassing losses here and there. Against Newcastle United, PSG simply crumbled mentally and tactically and while we blame the players for poor performances, we have to blame the coach too for a poor outing. Eddie Howe simply outclassed and bossed the PSG mega team. Good points for Newcastle United, Enough matches to bounce back for PSG in the champions League.
PSG should bounce back in the league game comfortably this weekend.
Well you're right, what they're going through normally occurs when a club is undergoing a rebuilding, and i think their fans needs to be calm and trust the process, they've got a good coach and a team filled with experienced players therefore if the players work hard on the training ground and put heads together with the coach to work on a better strategy, i believe they'll do better, Even Eddie Howe at some point this season slacked and were performing poorly in the EPL but they didn't give up, but rather worked harder to produce good results currently.
Therefore i believe that if PSG work hard enough as and maybe figure out a better tactics maybe they'll begin to do better and start winning games as expected, well they need to be very focused against Rennes and play with a good team spirit else they may end up getting another lose.