Antony was sold by Manchester United to Betis for a fee of €22m.
Speaking to Radio Cope, the Brazil international revealed: "I spoke with Bayern, I don’t know if it was €7m (£6m-a-year contract offer), but I said I had Betis’ word and that it was 95% certain and that I would respect my word.
"I feel comfortable making this decision because I’m very happy here. More than five teams called me. Today will mark my life; it was very emotional, and I’ve never experienced that before.
"My family is very happy; it’s very hard to be away from them, and it’s been very hard being alone in the hotel for more than 40 days. My wife was waiting in Seville, and I told her my first choice was Betis.
"I was very moved seeing the affection of the Betis fans; I couldn’t get out of the car, so I ran out. It was a very nice party..."