I suspect it's coming from Duncan Castles, (spit!). An article linked by "Harry A Siddall for City_Xtra" last night:
City Xtra are back with our fourth edition of the daily transfer round-up, where we'll be collating everything in the world of Manchester City transfer rumours from the past 24 hours.
www.si.com
"Everything Bernardo Silva seems to be coming through Duncan Castles at the moment...What's clear is Bernardo Silva wants to leave Manchester City. Castles says the Portuguese international has two offers in La Liga: One from Atletico Madrid, and a second from Barcelona. The latter are also pursuing right-back Joao Cancelo, and are proposing ‘FFP swap’ deals with options including Sergi Roberto and Ousmane Dembele.
The stories around Bernardo Silva are certainly accelerating, but now Joao Cancelo has been added to the long list of Manchester City players linked with a move away."
Castles is a hateful character but someone is feeding him stories.