The FA's director of football development, Sir Trevor Brooking, says foreign imports are wrecking England's national team.
Speaking on the BBC's Inside Sport show, Brooking said: "I don't think you can underestimate the threat.
"Two or three years ago most people in the game would say they saw it coming, but hoped we would get by with some of the current squad and one or two of the youngsters.
"The truth is we have nowhere near the depth we should have and that will always be an issue as soon as you pick up injuries.
"We have that now in attack with the senior squad and we're struggling to find replacements."