Paris Saint-Germain coach Carlo Ancelotti blamed a lack of Champions League experience for their defeat to Porto on Wednesday night.
James Rodriguez grabbed the only goal for the hosts with seven minutes remaining to condemn PSG to their first defeat in Group A.
Despite an extensive squad rebuilding programme, funded by the club's Middle Eastern owners, Ancelotti still believes his players need more exposure to Europe's elite club competition before they can really make their mark.
He said: "It's our first defeat this season, but it's no wonder we lost because we faced a team more experienced than we are.
"We have not yet got enough experience to come here on a level playing field. Porto have many qualities and a strong identity. We need a little more time.
"We are disappointed, however, because we wanted to produce a better game here.
"The fact is, that wasn't possible and we must accept it.
"Don't forget we're quite a new team. On top of that, Porto produced a good performa...