Moura made just six substitute appearances for the French giants before making the switch to Tottenham Hotspur, where the Brazilian has penned a long-term deal.
However, the attacker has acknowledged that he still does not understand why he spent so much time on the sidelines between August and December.
The 25-year-old told France TV Sport: "I didn't understand why I was left out of the team. Until today, I don't understand.
"I had my best season the year before, second highest goalscorer, a lot of assists, and the most used player, and all of a sudden, the season started without me playing. I was at home.
"I went to training but at matches, I was at home. I was not even part of the group."
Moura has made two starts and three substitute outings since making the switch to North London.