The Wolves star, once described by Trapattoni as one of the best strikers in the English leagues, was left in the international wilderness as his domestic career suffered with the now Sky Bet League One side.
But the 30-year-old returned to the fold when Noel King took over as interim manager and was retained for the squad to face Latvia and Poland, the first of those games on Friday proving to be the first in new manager Martin O'Neill's reign.
Doyle made an appearance off the bench at the Aviva Stadium and hopes for another chance when the Irish head to Poznan on Tuesday.
He said: "You just put your head down, go again and get on with it, don't moan and try to get picked again. I did in the last squad and this time, so I will try to do the same.
"I was out for seven or eight months and it's a nice opportunity to be back involved again. I missed it, especially when the games were on, big games against Sweden and Austria in qualifiers.
"It makes you really want to come back and be involved again.
"It was tough, it was very tough. Four of us from Wolves went to the Euros and three or four months later, none of us were in the Ireland squad.
"The manager, Giovanni, told us at the time he felt with the morale at Wolves, it wouldn't have been good for us to come into the squad and I accepted that, I had no problems.
"It makes it a bit more difficult, obviously, but I don't think of it that way. I just get on with it and see if I can impress. I am enjoying playing at Wolves and hoping to win something - and if not, get automatic promotion - so we will see what it brings with Ireland then.
"It's been fantastic, to be honest. It doesn't matter what division you are in when you are winning games.
"Yesterday we won and we went top of the league - I'm disappointed they went top without me, but it's just nice to be around the place and everyone is smiling, everyone is happy and we are up and challenging to get promoted.
"It's not been easy, though. Actually, it's been very difficult. We haven't walked away with any games, but it's been enjoyable to be part of it."