"It didn't go well. With all the players suspended, I thought a draw would've been a good result, but it went this way," said the Brazilian.
"Mancini was angry, but we all were, as nobody likes to start the Champions League with a defeat. It's only right he was cross with us."
Julio Cesar added: "Last season we had a bad start as well, losing our first few games, but we qualified anyway and so must carry on with our heads held high.
"We have a very strong squad and with these players, we must always believe in our potential.
"I think that the Coach can better explain what went wrong tonight, so I don't like discussing these things."