Stuart Pearce admits Mark Noble made the right decision by pledging his international future to England.
The West Ham midfielder was sounded out by the Football Association of Ireland earlier in his career due to his Irish grandparents.
But Noble turned them down in favour of playing for England.
And after missing last week's Under 21 Euro 2009 qualifier against Montenegro through suspension, Noble was recalled by Pearce for Tuesday's match against the Republic and scored twice in a 3-0 win.
"From my point of view, he made the right choice," said the Under 21 boss.
"He's a big part of this group and was disappointed to be watching the game on Friday through suspension."
The result helped Pearce's England maintain their 100 per cent record and capped a tremendous display.
Pearce added: "I was delighted with the performance. They were sensational.
"Whenever you take the field against an Irish team and you are wearing the
Three Lions, you know what you are going to get from the opposition.
"We matched them for endeavour and had the cutting edge.
"It wasn't easy. But we took our chances when they arose. I think we created our own good fortune.
"It was not one-way traffic so we made it easier with our finishing."