"We've got a lot of players that a lot of people probably haven't seen, but we know what they can do," said Carey.
"It was part of our game-plan to introduce players like that and unsettle them because very often you don't have to be the best player in the world, but if you're quick, you'll cause problems.
"Josh came on tonight and gave us something to think about because he performed very, very well and really unsettled the Port Vale defence. Matty caused them problems as well.
"We take a lot of encouragement but as I stressed to the players afterwards we've got to keep doing this every day in training, every game, set ourselves some standards and try and reach them every time we go on the pitch because you can't accept anything else at this stage."