Under new boss Lampard, the Denmark international has started in all three games, and gave a glimpse into what it is like under the iconic former Chelsea midfielder.
"So far, it's been good," Christensen told Sky Sports. "I've got a lot of game time in the beginning so for me personally, it's been good. [Lampard] has brought back a lot of what he liked to do as a player - a lot of possession games, a lot of hard work but in a good way, with the ball.
"He brought a lot of people back too, either from the youth team or people who have been away and has brought them back. Everyone out there knows what Chelsea is about and that feeling has been good to take in.
"My first season with the first team was [Lampard's] last one. I've always looked up to the big players and big names at the club and he was certainly one of them. I remember that he was very professional, he worked hard and I enjoyed the short time I had to play with him."