Carra can see both youngsters pushing for England honours.
"Over the years it has had a bit of criticism," said the veteran. "But there can't be many clubs who produced more quality players than us.
"Spearing has been fantastic and Martin Kelly could have been in the last England squad if he had not picked up a knock.
"It looks like we have got a few more coming through as well.
"It bodes really well for the future."