The Aston Villa boss believes the striker, who has failed to score in his last seven appearances, set a high standard for himself following last season's 23-goal haul
The Belgium international, whose campaign has been hampered by a hip injury, has not scored in his last seven appearances for Villa.
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"I'm pretty sure Christian's a victim of his own success but he's created that himself," Lambert told reporters.
"There's nobody he can blame for that other than himself because he set a really high standard for himself and, when you fall below it, that's what can happen.
“The challenge is for him to bounce back."