The best Chelsea cam do is park the bus if they try going head to head with PSG they'll get dominated in all areas thereby creating space for PSG to attack better and score. They shouldn't even allow PSG score first cause it would weaken them just like it happened to Madrid, Bayern, Inter and Atletico Madrid. Parking the bus is the best approach so they'll get a possible counter and score first. On a second thought I see everyone hyping PSG what if Chelsea happen to win with ease?
It could happen in a football match because a team will definitely have ups and downs that will happen and it will continue, of course Chelsea has fixed it with a strategy that has been arranged and PSG also applies many strategies that are difficult for their opponents to predict, especially regarding the many quality players and that is a strong support for their team, even though many teams conceded the first goal, at least they were able to equalize or reply.