This is a very tricky game for Liverpool, few weeks ago i felt that Liverpool will comfortable get the win in this game, but atm, Liverpool's form has really depreciated and Leipzig is the kind of team that can cause an upset; the only good thing for Liverpool is that the second leg will be played in Anfield and at home Liverpool will definitely have the advantage, while the first leg will be played on a neutral ground, which prolly doesn't favor anyone.
Of course, PSG will lose keys players if their injury situations do not change before the game, but nonetheless, they still have a formidable team and good quality players that can still cause Barca problems, I think PSG will win this game.