Italian midfielder Marco Verratti returned to the starting XI after several weeks out with ankle troubles, and played just short of one hour before being substituted. "We have to wait for Marco's opinion".
"We always hope but the first exams are not good", Tuchel said.
"There are lots of plan Bs now".
"My feeling is that it's going to be very hard for him to play".
Angel Di Maria and Julian Draxler are, of course, big threats as well, but Mbappe acting as the creative force in attack is certainly better for United than him using his pace to get in behind.
Paris Saint-Germain have to improve their attitude if they are to beat Manchester United in the last 16 of the Champions League, Gianluigi Buffon has warned. We are no longer looking at Plan B, but Plan D! "They need to know how to control and handle the pressure, but without two or three of them, it is up to us to come up with solutions". "But we're ready for Manchester and I have faith in my players".
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The reigning champions are 13 points clear at the top with a game in hand on second-placed Lille, who visit Guingamp on Sunday.
"Verratti can play and will play", said the German coach.
PSG's injury list grew further with right back Thomas Meunier also ruled out of Tuesday's game with mild concussion.
Mid-table Bordeaux slumped to a fourth straight loss between league and cup, although they almost equalised on the hour when Francois Kamano's shot from 20 yards was superbly saved by Gianluigi Buffon.
Mario Balotelli and Lucas Ocampos scored as Marseille won 2-1 at Dijon on Friday.