Wigan Athletic boss Roberto Martinez feels England have been caught out ignoring Victor Moses.
Former Crystal Palace star Moses was outstanding for the 1-1 draw with Norwich City on Saturday.
Moses, who made his Under-21 debut at the start of last season, was only on Stuart Pearce's stand-by list for the tournament in Denmark and has now decided to play for Nigeria instead.
"It was a shame when they decided not to call him up because I think it was a big miss for England," said Martinez.
"I think he's played enough games in the Premier League for people to know about him. I don't think Victor is an unknown or someone no-one knows about.
"He's a unique player but he's also a really quiet boy. I think it would surprise you.
"He wants to be the best that he can be and he loves playing football. That's refreshing nowadays, to have a player who loves playing football. I know it sounds strange, but there are not many."
