The midfielder has followed manager Enzo Maresca from Leicester City to Chelsea.
Advertisement
Advertisement
"It has undoubtedly helped to have a past with the coaching staff," Dewsbury-Hall told the club's website.
"They are all top guys, but also fantastic coaches who keep things professional. It was good to see them again after a long summer break.
"It was nice to get that feeling. It has been a complicated and stressful time over the summer, but as soon as you walk in the door, you are happy and ready to go.
"This is how I feel now."