While it is true that you cannot stop all people from saying things, I would think that friends and national team colleagues could be approached and told reasonably firmly "shut the f**k up".
I put the definition of conspiracy in my post to show that what I was suggesting that Fabregas is doing is NOT a conspiracy. There is nothing illegal, wrongful or subversive in it. I may not like it and consider it sneaky and underhand but there is nothing illegal about it.