Ahead of today's clash with Manchester United, Deulofeu says Pearson has lifted the intensity of their play.
"You can see the difference in the last game," he said.
"We are playing I think much better because we are playing with more intensity, more high pressing and more ambition to take wins because we need it and we are happy, but finally we lost last week against Liverpool and we want to win our first game at home. The feelings are really good.
"We are working on that [finishing] because we are not good enough in the last third, finishing. But we have time, always I said it's not how we start, it's how we're going to finish and I think we are in the right way playing like this with the high press, with intensity, pressing high."