The purpose of a buy back clause is that if we decide to sell, the original club gets first refusal, and usually at a knock down price. It doesnt mean that the original selling club can just swoop in and kidnap the lad and make him play for Barca again against his will when he is happy and settled in England. Both Chelsea and Romeu would need to consent to the sale. And as someone said above, I wouldnt listen to anything the Sun reports, dont know which translator they employ but he usually gets things completely wrong when reporting about foreign clubs.