Shelvey was speaking after their preseason win over West Ham.
He said: “At every club when a new manager comes in the training goes up a notch. The players get busy and everyone's looking to impress because everyone gets a clean slate, everyone gets to start over and try and get into that starting XI. I think that's what everyone has tried to do today.
“We did a long old run the day before a game and I've never really experienced that. I thought I'd be knackered but I wasn't, I was alright. He's made a massive difference. He's constantly talking to you, telling you what he's thinking and things like that. As a player, that's what you want. You want to know what a manager's thinking and where you fit in his plans. It's good."
It was night and day from the Wolves defeat.
“The other night we weren't good enough," Shelvey admitted.
“We only had a few weeks of work on the formation and Steve's come in and changed it again and we've had two days and look a lot more comfortable with five at the back and I think we thoroughly deserved to win.
“Steve came in and said a few bits and he told us what he wants us to do in and out of possession and in the first half we looked very comfortable. In the second half we knew they were going to come out a bit more but I felt we dealt with them effectively and went on to win."