Chelsea are a very lucky team that they have one of the easiest matchups among the favourite clubs to win the Champions League title. And it was really interesting to see that they got a draw against Lille two times. 
It must be really frustrating for Lille. As Lille are not having a very satisfying season, Chelsea should be able to move them out of the CL by not having too much problem. I know that there has been a decrease in Chelsea's performance lately but they are still too powerful against their opponent.
In the league they do look to have a declining performance. It seems like it happened because they have a lot of players who are injured and affected by Covid-19. Kante who became the first choice suffered an injury, and chelsea's game was like losing a midfielder tirelessly. The UCL knockout stages are still long enough, I think chelsea will go through the transfer market as well. They can add players to fix their weaknesses. Besides I think the next game at UCL is the best players in the best of circumstances. It must be really frustrating for Lille. As Lille are not having a very satisfying season, Chelsea should be able to move them out of the CL by not having too much problem. I know that there has been a decrease in Chelsea's performance lately but they are still too powerful against their opponent.If we compare PSG, Manchester United or Manchester City, Chelsea has the least number of star players. Moreover, the pace of Chelsea's game has slowed down a bit now. In January, Chelsea's management should appoint some experienced players to the team. Their defense is strong enough, but forward lineup needs some improvement.