Reid has returned to the Ireland squad for World Cup qualifiers in Germany on Friday and against Kazakhstan in Dublin next Tuesday.
The 31-year-old won his last cap against San Marino in November 2006, when he scored in a 5-0 victory, before falling out of favour under former boss Giovanni Trapattoni.
And the former Charlton, Tottenham and Sunderland player is delighted to be involved again for his country following a good run of form with Forest.
Reid said: "After the break that I've had it's really, really good to be back amongst the group and preparing for an international game again, because I suppose there were probably times when I didn't think it might happen.
"I feel I've been playing really well, so I was in with an opportunity of being selected if it was being picked on merit and on performances.
"As I say, I feel I've been playing well."
Ireland v Kazakhstan is live on Sky Sports on Tuesday, 15 October