Romelu Lukaku has previously played in the Champions League with his former club Anderlecht.
"They are both great players with high technical ability", Silva said. I don't put him on a pedestal.
The club failed to secure a replacement for Dedryck Boyata and Erik Sviatchenko in the summer transfer window, leaving question marks over their solidity at the back in Europe.
It was a rough start to what will be a challenging Group B, against the side who aren't even the top seeds - Celtic still have to take on the giants of Bayern Munich.
PSG have created 78 chances in Ligue 1 this season.
If Celtic need a reminder of the size of the task ahead of them, they only need to think back to their humbling by Barcelona in the same competition last season.
PSG are under investigation by Uefa for suspected breaches of the Financial Fair Play rules but, until such time as the governing body decides otherwise, Unai Emery's side have the capacity to inflict serious damage on those who cross their paths.
Emery had identified Leigh Griffiths as the danger man for Celtic before the game and the striker came close to an equaliser when his curling free-kick was tipped over by Alphonse Areola.
The 25-year-old told The Scottish Sun, "Booing does not bother me - it's boring, but that's it".
Yet Celtic's hope of at least holding PSG scoreless in the second half disappeared when Lustig had the misfortune of deflecting Draxler's driven ball from the right into his own goal. In matchweek 1 they visit Feyenoord and we're not sure they'll get the win.
"I don't know why he is doing this, does he try to perturb us?"
They had just taken a three-goal lead courtesy of Edinson Cavani's penalty when the fan invaded the pitch moments later around five minutes before the break.
While you're here.Watch Eamon Dunphy, Andy Reid, Dion Fanning and Wooly on a SportsJOE Live Irish football special.