Giroud felt PSG were a class above last season.
He told arsenal.com: "I followed the French league closely this season. I thought PSG were playing and winning with ease. Take Ibrahimovic, he is not always brilliant in the game but he is very often decisive. That's what you ask him to do. He had an amazing season. It's not just him.
"They are impressive at the back with Thiago Silva who brings a lot of serenity, despite being still quite young. Lavezzi and Pastore had a good season too, Lucas is a future world-class player. For me, PSG will be a strong candidate to win the Champions League in the coming years. It would be good though if Marseille and other big clubs make the league more competitive by competing with Paris."