The 36 year old, whose contract runs out at the end of the season, was linked with a loan move to Bournemouth earlier in the week.
Conte said: "I didn't know about Bournemouth interest for John. John is an important player for me and if he doesn't play, he is a really important man in the changing room. This squad needs him.
"His work on the pitch and in the changing room outside is fantastic. This shows he is a great player but also a great man.
"For me it is fantastic to have a person like him to help me in my first season in Chelsea. For this reason I repeat, John will stay with us in my squad.
"When I see a situation for him to start to play he will play, but he is a really important player for me."