The ex-Aston Villa star said: "They have all been on top form this season, and it's great for us that we've got the players there that are playing at the top of their game and playing with confidence.
"You can see each and every week the problems that they cause the opposition defences.
"I'm delighted if all three go to the World Cup. They've got to be at the forefront of Roy Hodgson's thoughts."
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