Despite taking nothing for granted, 26-year-old Cahill is hoping that his transfer works out well for both club and country.
"I am sure that the England manager is happy that there is a possibility we could be playing together but you have to be respectful of the fact that I have to earn my position in this team by working hard in training," Cahill told Chelsea TV.
"Coming to a club like Chelsea, there are top-class, international players all the way through the squad so there is going to be strong competition and it is not going to be easy. I just hope when I get my chance I take it.
"Obviously playing with the English boys here will help our understanding. But I am taking nothing for granted. I am coming here to work hard and try to get in the team first of all."
Cahill has made seven appearances for England.