Swansea meet Watford for Carvalhal's first game in charge.
Swansea need results fast and their new boss said: “We are now five points adrift and the team aren't playing good football. They aren't scoring or creating chances.
“I've seen a lot of things in football. When you change some things, when you create a new dynamic, the players can surprise you and they can change to another level.
“So it's our work to try to give confidence to them to show that they are better than what they have shown. After this we will take decisions in different aspects."