Despite the defeat, Lambert has said that he was impressed with his side's gameplan ahead of the match.
"I thought we were excellent, I really did. How we've lost it, I don't know," the manager told Sky Sports News. "The first goal I can understand because they get the break of the ball but the second goal was really, really poor from our side when we've looked really comfortable all afternoon.
"I thought we looked great football wise and we came here with a game plan that was excellent. We got the goal and should have had another one or two after it. I was disappointed it was 1-0 at half-time, and even in the second half, we had some good moments.
"I'm obviously really disappointed with losing the game but I'm not disappointed by how we've been playing. We played a good game and the very least, we should be leaving here with a draw."
The result kept Stoke in the relegation zone, but the Potters are only in the bottom three on goal difference.