Paris Saint-Germain could make Kylian Mbappe a substitute for this week's Champions League match due to his recent poor form.

"Like the others, Kylian might start but he also might not," Unai Emery responded at his prematch news conference. "The most important thing is that the players are respected and told first [if they are not going to start]. The players will only discover this tomorrow.

"Kylian's recent form? I have analysed his 10 matches with us so far and generally speaking, his performances were of a high quality. However, it is also true that some of his showings were less good than others.

"Kylian has come here to develop and to help PSG to grow. Competition within the squad is good. I want displays to be collective in their nature. I am satisfied with the way things have gone with him, so far."

Mbappe moved from Monaco to PSG this August.

"Kylian is fine, both mentally and physically," said Emery. "I have spoken with him and it is a new experience for him -- he reads all of the comments in the media.

"It is important to overcome these tough moments. You learn each and every day. Even more so when you are still just 18.

"It is normal that he is going through a learning process. With his humility, he will grow much, much more. PSG will be champions in the future and he will be [a champion] too."