He is happy with his decision to sign for the Catalan club, as he explained in a recent interview shortly after the 6-0 win over Pumas.
Lewandowski is, however, slightly sad about the manner in which things ended with Bayern Munich.
"I know that hurt a lot of fans," he told Sport1. "I can understand that and now I just apologise for that. At that time it was important and necessary for me to make it clear that I was ready for a change.
"At the end of the day, we are all human. After 12 years in Germany, it was clear to me that my time was over. I wanted to make that clear, and of course it was not easy for Bayern to accept a sale during this phase.
"It was a difficult situation for everyone involved and we had to find the best solution. I needed this change, this move to another country, to another club. I feel like a child who has a new toy."
Some Bayern fans yelled pro-Real Madrid slogans like 'Hala Madrid' at the striker as he left the Bavarian's training camp when he returned to collect his things.
"Yes, I heard that, and I laughed," he said. "But there were also some people shouting my name. That was really nice.
"In the last few weeks I have also met some fans in the street who have expressed their understanding for my situation and wished me all the best."