The youngster told L'Equipe: "Chelsea's sporting director Michael Emenalo told me [in July] it will depend on the coach's choices. I explained I would wait to see how it goes in preseason.
"My decision is definite now. It is an important moment in my career. It is better for me to leave the club and find one where I could play matches regularly."
The France Under-21 international has had a taste of first team experience during his previous loan spells at Fulham, Bolton and Dijon, and is looking to further his opportunities away from the club, rather than seeing out the three years that remain on his contract.
"Chelsea told me they rely on me. It is nice to rely on me, but I am 21 years old. You can tell me that at 17 years old or 18 years old, but I need to play. I thought more players would have left the club," Kakuta said.
He added, "Stepping back, I believe Ligue 1 will be good for me. It will be a good stay. My objective is to play a complete season with 25 matches."
"Marseille is a club I like. In France, they are one of the three clubs I am following the most with Lyon and Lille. With the players they have, I have no concerns. The club is not finished."
- Michael Emenalo