Its a rule over freedom of movement within the EU, the ruling was made as he was working in an associated country at the time and treated different. Sterling isn't. He is clearly working in a non EU country and looking for a transfer in.
When Madrid sell him on the rule would be applicable, as far I read reads anyway.
i'll ask one of the lawyers on FT.
It has nothing to do with where you used to work. The only thing that matters is of you’re employed in the EU? If yes you have extended rights. Sterling would be working in the EU when he joins Madrid.
Every cricketer that ever used this rule was coming from outside the EU.
I can’t explain this any more clearly so if some random twitter account telling you you’re wrong is going to satisfy you then go for it, I give up.