Martin O'Neill has warned his young Aston Villa stars of the ruthless nature of the England national team.

"Gabby (Agbonlahor) has got the pace, he's got the strength and he can hold it up, but there are things he can sharpen up more," said O'Neill. "But this is the problem at international level, you only get a couple of cracks at it.

"There's a charge for you to get into the squad and suddenly you play and maybe only play half an hour.

"Things don't work out for you and suddenly there's a clamour to get you back out again."