Bent found the going tough at West Ham United but Lambert is adamant the star striker needs better service from his team.
He told Villa's website: "Darren will score, that's for sure. He's a goal threat. We just have to get the service to him. That's the key.
"I thought we had a lot of the ball, especially the first half-hour. We knocked it about well and we started very well.
"But if you have a lot of the ball you've got to try and create. You've got to be more penetrative than what we were. But Bent is a goalscorer!"