He said: "Things have been difficult at Chelsea because of the start we have made and the team were not settled, but we have picked up a couple of good results.
"As far as my form goes, I think I'm doing ok. I've been in better form, I've been in worse. The important thing is that I'm confident coming into these games.
"There have been times when I have performed well and been left out but the majority of times, you stay in. That's how it should be.
"All I know is that, if I play well, I merit a place in this side. I'm happy with my last three or four performances for England and I want to build on that. That is what I am focusing on."