To put this to bed(maybe). Seville can do nothing, the contracts are registered with the Spanish FA so as soon as you inform the FA you plan to trigger the release clause the FA give permission to speak to the player and the club can do nothing. Real Madrid signed Sergio Ramos in this way minutes before a deadline.
I wasn't aware of that so I defer to your better knowledge if that's the case a_p.
My post presumed there was an interaction with the club at some junction.