Weimann's scoring touch deserted him when he somehow conspired to fire wide from point-blank range early in Sunday's 2-1 victory over West Ham at Villa Park.
N'Zogbia told the Express & Star: "Andi is a top player. Maybe he thought it was too easy to score and that happens.
"But I know next game, if something like that happens, he will score right away. I've got no worry about him.
"He is a really hard-working player and just wants to score. I know he is going to score in the next couple of games or so."