Even at a big team like Chelsea, I think he'll be able to compete and secure a starting spot. The 22-year-old Dutchman has already demonstrated his quality, and despite his relatively young age, he still has the potential to develop further.
I see Xavi Simons as a player lacking ambition. As a result, his moves from one club to another haven't brought much satisfaction to the clubs he plays for. Therefore at Chelsea it depends on whether his ambition has been realized or remains stagnant. We'll see, because considering his age, many players have proven their ambition is useful.
Another thing is that Chelsea is currently focused solely on preparing players to be sold at a higher price to other clubs.