If I were Athletico I would make sure not to trigger the purchase option sending him back to Juve while telling him to refuse all destinations next season saying he only wants them just like we tried with Kolo Muani.
This way they'll likely get another loan for a lousy fee and save themselves the €32m but still get the player.
Players always hold the cards in these situations.
I think this guy will be eternally loaned out like Melo, Arthur and many before them until we pay to terminate his contract.
Hope I'm wrong.