The 23-year-old quickly put his defeat at the hands of Briton Luke Campbell in the bantamweight final at London 2012 to the back of his mind by singing with Amir Khan's promotional team.
However a growing comprehension of how close he came to realising his Olympic dream, losing by just three points 14-11 to Campbell, has forced the Irish fighter into an unlikely U-turn.
He has seen improvements for the British Lionhearts in the World Series of Boxing, most recently defeating Daouda Sow, the Olympic lightweight silver medallist from Beijing 2008, in London last week.
And, admitting he may have rushed the decision to turn pro, Nevin now fully intends to go one better at the 2016 Olympic Games in Rio.
"It was always my intention to turn professional after London but I was a bit hasty in my decision and the more I thought about it the more I wanted to carry on and go for a gold medal in Rio," said Nevin.
"It is only four years away and I will still only be 27-years-old. There are so many more opportunities in the amateurs now, and I know I will be a much stronger fighter in four years' time.
"I don't know what Luke will decide to do but I would love to face him again in Rio with the gold medal at stake. I felt our final was so close it could have gone either way and that is what drives me to do it again."
- Sports & Recreation