Chalobah is currently on-loan at Ipswich Town.
He told chelseafc.com: "It hasn't been the same as I expected. A lot of people know the Championship is a physical, tough league, but playing in it is different. Obviously it is physical, and I think I have dealt with that, but there's the tactical side as well.
"The time you get in Academy football is nothing like in the Championship. You have players straight on you when you get the ball. That is where awareness is so important and I have improved in that area as time has gone on.
"I think my technical ability has improved a lot as well. I like getting on the ball. At Chelsea I would work on my technical side a lot. Here with the teams you come up against are often direct, so you need long-range passing."