Cavani suffered a leg injury on Saturday, probably when blasting home the 42nd-minute penalty that gave PSG a 1-0 victory in Bordeaux. After he left the pitch, it was more hard for us to control the game.
And PSG coach Tuchel told TF1's Telefoot on Sunday morning: "There is no good news this morning".
"I think we have to improve in terms of mentality, attitude and the spirit of sacrifice for the team". We do not have a second Edi, nor a second Neymar.
"I do not know [if he will be fit]".
PSG will are already missing superstar striker Neymar sidelined until at least April with a foot injury.
"On Tuesday, a very important game is waiting for us", he said, per Goal.
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.
"If two or three key players are not there, it is our responsibility to find solutions".
"It's super hard. If we miss several players the challenge will be even bigger".
The was some good news for PSG as midfielder Marco Verratti returned to the line-up after recovering from an ankle injury. "But we will be ready on Tuesday".
Such is their margin for error domestically that Tuchel could afford to wrap a host of key players in cotton wool with the Champions League in mind.
Asked if today's win was ideal preparation for facing PSG, he said: "Yes, I would have to say so because it's a tough place to come".
Verratti lasted just under an hour before making way for recent signing Leandro Paredes, and Tuchel must now decide whether to start the Italian playmaker in England.