The firebrand was on the bench at the Nou Camp and confessed it was an emotional moment.
"It was incredible, I am without words," he told Inter Channel. "It was the first time I cried over a football match. I'm just so happy."
The Nerazzurri were welcomed home at the airport by a crowd of fans, but there were also insulting jeers towards Balotelli.
"I speak to the fans who interpreted certain things as being against them. I apologise again.
"The fans have always helped and supported me, so they should know I am with them."