The Brazilian, who has been linked with a move to Inter Milan, stated that he looks forward to fulfilling his dream of playing in front of the club's supporters at the Camp Nou.
"Hello, Barcelona fans," Emerson said in a video on his Instagram page.
"We will be together soon.
"I want you to know that you are part of my childhood dream, I wanted to play for Barcelona and today it's a reality.
"Visca el Barca and visca Catalunya."