Tomori joined Milan from the London club in June last year after impressing in a loan spell and played a key role as they won their first league title in 11 years last season.
"It's just another chance for me to see some familiar faces as well as to, I guess, show how I've developed. I know people have watched the Milan games but going back to Stamford Bridge where it all kind of started, it's another chance to show myself again."
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