John Stones has, simply put, not been good enough this season.
The English defender has had moments of genius this season, but he has been far too inconsistent – and at a top club like Man City, you cannot afford to be inconsistent.
Niklas Sule would offer Guardiola an alternative. An option should he need resilience and stability in the heart of his defence, and at just 21-years-old – he would, like Stones, be a long-term solution.
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