PSG travel to Stamford Bridge with the tie level at 1-1 following the first leg at the Parc des Princes, however, Chelsea hold a slight advantage courtesy of their away goal in the French capital.
Luiz left Chelsea for PSG in a £50 million move last June after his only season under the stewardship of Mourinho, who has long been referred to as "the special one".
But Luiz told a L'Equipe journalist: "He is special for you, not for me.
"I had some great moments at Chelsea and won a lot of titles. I was very happy.
"They are having a great season, defend well and have great players but above all I know my team. We will try to score there and play like we know how.
"We will have a good game plan and implement it the best way possible to achieve a great performance. Both can still qualify."
'People will remember us because we got to No.1 in the world rankings and achieved great things - but our biggest regret is that we didn’t win anything': Ex-Everton star Kevin Mirallas opens up on 'honour' of being part of nation's golden generation
‘I’m sure we’d have finished in the top four or five if he hadn’t joined Chelsea in January. Him leaving damaged the team, but we couldn’t stand in his way’: Alan Curbishley reflects on failed Champions League dream after selling key player
