I think he's holding out on Lucho's decision. If he wants him to stay, he'll stay. So far Lucho seems like a smart man, which is why I can't see him letting Alexis go - especially not, if we're only getting 20-25M to add to a potential replacement.
IF Lucho isn't sold on him, though, I don't think Alexis would think twice about leaving.
But so far, I won't pay much attention to these rumours.
I hope. It's just stupid to sell him after having a great season at Barca. Imagine we sell him and he has a great WC as well? We would be the laughing stock of world football ( which we are anyway).