Ahead of their League Cup clash with Rotherham on Wednesday night, Lambert believes that his side have developed a great deal since losing to Bradford in last year's semi-final.
"There's a different feeling in the football club this time, totally different. The players are different, a different mindset, new lads have come in, some lads have left. We needed to freshen it up, but there's a totally different mindset altogether now," he is quoted as saying by Sporting Life.
The Scottish tactician revealed that he will not be taking the League One outfit lightly, and will prepare for the competition with the aim of winning it.