Imo in this climate no one would like to splash their cash out, even those oil money, they have FFP over their head. Plus, his current form doesn't help either. He's no longer the hot deal he was.
So, a swap deal would be ideal I think. But for swap deals, just forget the hot ones, clubs generally only swap players they consider surplus or somehow doesn't perform well. I like Griezmann, something is clearly wrong with him at Barca. But imo he's still a very quality player who could play anywhere across the attack line. He seems to be very professional and a good chap I think.