It would be a slap in the face to his lifelong club Barcelona. Chelsea and Barcelona have had the most heated of relationships for many years anad even more so after they somehow managed to progress past them last season. He wants a stable club, not one essentially run by Abramovich sacking managers left and right. The philosiphy is so different at Chelsea to what is engrained into his mentality, youth systems, supporters club etc.... Chelsea just buy all of their talent I think he will go to United.