Butland is on-loan at Elland Road for the season.
The one-cap England international admitted: "This summer is a massive target. I'd love to go to a World Cup, it's a dream of mine.
"It's only a target if I'm playing regularly and doing well. I've got to focus on each game, and if I'm playing well I'll stand a chance. If I'm not, then I won't."
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