The England international will face his ex-club for the first time since joining Milan in January 2021.
He is a product of the Chelsea academy and played 27 competitive games with the Blues before his move to Milan.
“Chelsea are a great team, with good players,” he told Sportmediaset before Milan’s trip to London.
“We are focused on our game and we know we will be up to the task if we play as we know.”
Milan have four points after two games, while the Blues have only earned one and tomorrow’s match with the Serie A champions is crucial for their qualification hopes.
“They have one point but are still a strong team,” warned Tomori.
“It’s going to be a tough match because they have valuable players, but we also do and of course, I hope we can win.
“I am excited and happy to return to Stamford Bridge, I want to help the team earn three points.”
Tomori has scored two goals in 72 appearances with Milan. What if he finds the net against his former club tomorrow? “We’ll see,” said the 24-year-old.
Milan beat Empoli 3-1 win away on Saturday, while Chelsea won 2-1 against Crystal Palace.
The Rossoneri trained this morning in Milanello and will soon fly to London, where coach Stefano Pioli will hold a pre-match press conference at 19.20 UK time.