Rafinha is delighted to return to Barcelona.
The midfielder spent last season on-loan at Celta Vigo, where he played for new Barca coach Luis Enrique.
"I learned the game for seven years here and I'm thrilled to be back, it's a great challenge for me I want to learn from these brilliant players," he said.
"Luis Enrique is someone who does everything to make sure he does things well."
For the big stories and the banter follow us on Twitter: @tribalfootball