Balotelli was left out by boss Cesare Prandelli as punishment for his dismissal in January's game against Tottenham.
"The European Championship is something that I think about often," he stated after Italy lost 1-0 to the USA without him.
"I was disappointed to have not been called up for the friendly in Genoa. There is a code of ethics that I respect, even if I think that I didn't deserve to be excluded.
"It left me upset because, for me, there is no shirt more fascinating than that of the national side because of the emotions that I feel when I represent Italy."