Balotelli was dismissed for arguing with the referee at the end of Sunday's 2-1 home defeat and suspended the following day.
"I apologise to my team mates, who train hard every day. I also apologise to the referee," he said in an interview with Sky Sports Italia. "I reacted the wrong way to provocation.
"Mario has made a mistake," he added. "He has been provoked and made a mistake in reacting.
"If Mario makes a bad mistake, Mario should be punished...But against Napoli it was the same old story, the fouls against me didn't count for anything, I was the only one who could do anything wrong."
- Sports & Recreation