The midfielder is earning rave reviews for his all-action performances this season with Lambert believing he has an outside chance of staking a claim for a World Cup place.
Lambert said: "We are creating things at the moment and look a real threat - and Delph is at the heart of that.
"He's a real moaner. Sometimes you need people like that, people who moan just for the sake of moaning!
"Don't get me wrong, he's a very likeable guy, but you name it, he'll moan about it."
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