With the 18-year-old seemingly available on a free transfer later in 2020, Chelsea have been heavily linked with an approach for the Dutchman.
Barros told VI: "Almost all major clubs in Europe have asked about Xavier. Real Madrid is also there, they are serious about their education, but that would of course be a sensitive switch. Juventus and Inter are interested, as are top clubs from Germany and England.
"Chelsea have the best credentials. Of course, we discussed this extensively last year. They gave a fantastic presentation.
"There is a unique football atmosphere there. During lunch you are immediately with the first-team players and the club has outlined a very ambitious plan for Xavier."
Although Mbuyamba still has three years left on his contract, Barcelona are said to have no space for the prospect in their 'B' team setup.