Kozak has scored three goals that have helped Villa win three matches, to Lambert's obvious delight.
"He's scored some big, big goals for us since he has been here," said Lambert.
"I'm delighted with him and his contribution because he takes so many knocks, but he scored another goal (against Southampton) and it was a great header because he had to put his head in.
"Off the pitch he's a really nice, well-mannered guy, someone you sense is desperate to do well in this country."
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