According to Ruben Loftus-Cheek, he decided to leave Chelsea last year.
CHELSEA

_______________________________________________
The 27-year-old joined Italian giants in a deal worth an initial £14m, with a further £3m potentially due in add-ons, and has permanently left the Blues after nearly two decades with the club.
Loftus-Cheek started half of the Blues’ Premier League games last season, but he decided to look elsewhere because he was dissatisfied with the positions that four different managers had given him to play during a turbulent year.
Along with Christian Pulisic, who will shortly leave the Blues, he joins Fikayo Tomori, an English teammate and former Chelsea colleague, in Milan, and claims the defender was instrumental in helping him make the decision.
Enzo Fernandez sends Paulo Dybala transfer message as Chelsea eye £10m swoop
“When I could potentially move to AC Milan, I was asking a lot of questions about general life in Milan, training, where does he live. Get a picture of what it is like to live in Milan and play for AC Milan. He definitely pulled me in,” he told a press conference on Tuesday.
“I was looking for something new. I had been at Chelsea a long tim and it seemed like a good moment to move on. I wasn’t necessarily looking abroad but assessing options. AC Milan are huge and it’s not something I would turn down, playing for a huge club and to learn a language. It made sense to me.”
He continued: “At the start of the season I didn’t know [what I was going to do], but towards the end I started to feel as though I was ready for something new. I had been at the club for a while.
“I love the club and the fans but I wasn’t feeling content with the amount I was playing and the positions I was playing. I felt I had more to give. I wasn’t getting the opportunity to do that.
“I feel ready and I feel good physically. I am playing some really good football. I felt it was a good time to move on.”
Pulisic is expected to complete his own move to AC Milan this week and Loftus-Cheek has backed the American to shine at San Siro.”
Napoli chief delivers blow to Manchester United and Chelsea over Victor Osimhen transfer
He continued: “I have played with Puli for a number of years now. I have seen his talent. He has huge talent. We have seen that with Chelsea at times and definitely with his national team.
“The way he plays with his international team is top. Maybe at Chelsea, he hasn’t had the time to do that. I remember in the lockdown period, under Frank Lampard, he was incredible. If he can reproduce that again…
“I feel he was ready to move on as well. If he can play to his best, like I know he can, he is a top player, a dynamic player, he is quick and score goals. He would be a top addition to the team.”