The Brazil international joined the Blaugurana in a €68m deal on Wednesday.
According to Raphinha, it has been his dream and that of his family and friends from when he was young.
He said: “For me it’s a dream, not just mine but my family and friends.
“Whoever saw me play, knows that to get here is a dream that I’ve had since I was young. Now what I have to do is give my best and help Barça to return to being the Barça they always were.”
“I saw Ronaldinho and Neymar play here. I am one more Brazilian who is arriving at Barça and I hope to achieve what they achieved there,” the 25-year-old added.