Bacuna hit a beauty in victory over Cardiff City.
"I thought his free-kick against Manchester City was world class, but I thought that one surpassed it," said Lambert. "Leo, as I said the other time, can do that.
"I've seen him do it in training and it was just a fantastic technique for that free kick.
"You're never quite sure until you bring somebody to the football club you're never quite sure what their character's like and what they're like as a person.
"But, when I watch him in training, every time he hits one I think he's going to hit the target. Thankfully, that one as excellent. It actually started by the post when you look at it and it goes up and down really quickly. There wasn't much room for him to really aim at. His technique was fantastic."
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