The 26-year-old was handed a new and improved deal at Stamford Bridge in March, tying him to the club until 2021.
“It [the contract] gave me even more of a boost to go out there and enjoy my football,” Moses said.
“The new deal gave me a lot more confidence to say this is where I belong, this is where I want to play, this is where I want to help my team and to win trophies.
“Chelsea is one of the biggest football clubs in the world. I am happy here and enjoying it.
“I have always believed in myself. As a footballer it is essential to have that belief.
“I had been on loan three times. I always said to myself that I wanted to break into this team, to do the best I can for this football club.
“The right manager came in and recognised how hard I had worked. As a footballer, if you work hard, then everything else falls into place.”