Neymar joined Barca in the summer from Santos.
"I could have left Brazil earlier than I did - but I knew for my development it was about joining the right team at the right time," said Neymar.
"I knew there were other teams interested - but I would not have chosen Manchester City or anybody else.
"When I knew of Barcelona's interest it was an easy choice - they were in my heart right away. We sat down as a family to make the decision - but there was only ever one choice."