The Uruguay striker left the pitch on the stroke of halftime holding his thigh, soon after scoring with a penalty in the 42nd minute.
The French champions are already without Neymar for Tuesday's trip to Old Trafford and, after Cavani underwent tests on his thigh, Tuchel fears he will have to plan for facing United without his frontman too.
"I don't have good news", said PSG manager Thomas Tuchel. My feeling is that it will be very hard for him to play. My feeling is that it's going to be very hard for Ed to play, but we have to wait a little longer because he's taking exams now.
"I can't think about so many different plans in advance".
"The club will wait a little longer, but in my opinion the news will not be good".
"No [we are not favourites], I think we are tied, it's 50/50.""In matches like these, decisive Champions League games, you absolutely need your key men as they are experienced in handling pressure in matches like this one".
Italian midfielder Marco Verratti is also doubtful due to injury.
"I do not know [if he will be fit]".
Sprint files lawsuit against AT&T for phony 5G network | Digital
AT&T started this whole mess then it chose to relabel its LTE-Advanced (LTE-A) network as 5G Evolution (5G E). AT&T started rolling out the 5GE label on smartphones last month, and now the icon is appearing on iPhones .
Virginia lieutenant governor on sexual assault allegations: 'The interactions were consensual'
Ralph Northam told the Washington Post Saturday that he vows to spend the remaining three years of his term pursuing "equity". Virginia delegate Patrick Hope, a Democrat, said Friday night he will be bringing articles of impeachment against Fairfax.
House Dems Lay The Groundwork For Obtaining Donald Trump's Tax Returns
Although officials have already narrowed down some suspects, they say more research will be conducted before action is taken. The effort is being met with outright hostility from Republicans and skepticism even within Democratic ranks.
"If he comes off, obviously I am anxious".
Tuchel said: "Tonight Edinson suffered a muscle injury".
"We have lots of Plan Bs".
However, with the Portuguese's sacking, United have been on the uptrend under Ole Gunnar Solskjaer and they are now unbeaten in 11 successive games which includes 10 wins.
"But, if two or three key players are not here, it's our duty to find solutions".
While Tuchel needs Verratti against a United midfield featuring the in-form Paul Pogba, the 58 minutes he played may not be enough to get his rhythm back in time to face a revitalized United.
United have made similar mistakes in the six years since Alex Ferguson retired and only now under a former pupil of the Scot in Solskjaer are recovering some of the principles that once made them a dominant force in Europe.