8. Declan John (Cardiff City)
The 18-year-old left back is already a full Wales international, after making his debut in the World Cup qualifying win over Macedonia in October. John still has plenty to learn but has already featured eight times for Cardiff in the Premier League this season, making six starts, and does not look out of his depth.
In Gareth Bale, who started his career as a left back at Southampton, John has a ready-made role model in the national team set-up.
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