Cardiff defender Turner rejects Wales cap
The 24-year-old defender qualifies to play for Chris Coleman's side through his Welsh grandmother - and the Wales boss had been scouting his progress.
"I'm English and that's how it is," the Birmingham-born player told the BBC.
"I wouldn't want to stop anyone for wanting to play international football if they felt it was right for them and they can justify it in their own head.
"But I couldn't justify it for me and clear my own conscience. It would be like I was pretending to be a Welshman when I'm not."