He cannot spot a diagonal pass, or doesn't fancy himself converting one even under the most favourable circumstances. I don't know which is worse.
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By contrast;
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Dortmund were playing with wingbacks instead of actual fullbacks to begin with; and their left wingback got sent off. Those diagonal passes to the right should've been the first option to seek in situations like these.
This has nothing to do with Frank either; as managers like him who prefer more direct football would welcome such no-risk-nonzero-reward passes.
Discouraging to say the least.