Poch stands out as the obvious choice if he follows through with his threat to leave after Champions League Final. Would be a great move for him, and they could do much worse than him too.
I doubt Mourinho is in with any chance, he doesn't sound well liked in Italy outside of Inter. Plus that "earcupping" celebration earlier this season seemed to wind them up a bit.
Would Conte go back? He seems close to Inter, but obviously he far more ties to Juventus. Would they they want him? Could get over the line in the Champions League.
I'm not sure Ten Hag would be a good fit for them. It would have been interesting if Zidane had not returned to Madrid. Surely he would have been nailed on.