Paris Saint-Germain coach Thomas Tuchel has said he is unhappy after images circulated of his players partying after the 2-1 Champions League round of 16 first leg loss at Borussia Dortmund circulated on social media.

Several PSG players shared footage of themselves celebrating Edinson Cavani, Angel Di Maria and Mauro Icardi's birthdays earlier this week.

- Champions League round of 16: All you need to know

- ESPN Champions League fantasy: Sign up now!

"I was really surprised by the video on Friday -- really surprised," Tuchel told a prematch news conference ahead of the Ligue 1 clash with Bordeaux.

"We have spoken about it internally. I prefer not to talk about it -- that will stay private, between us. "However, yes, it has been discussed. It must stay internal, though. We are unhappy with these party images."