I think now De Jong is starting to feel that his decision to stay at Barcelona last summer was a big mistake, indeed Manchester United really wanted him at that time but I don't think the Champions League was the reason he stayed at Barcelona, because at that time there were several clubs playing in the champions league which want De jong but he also refused because he want to stay in barcelona, but now rumors of De Jong leaving are starting to come back after Barcelona condition worsened and also the difficulty of replacing the role of Busquest which was indeed more trusted by Xavi all this time, position later
.Therefore still not very late for Barcelona to turn things around and become strong again and he will enjoy staying at the club.
However this is still a rumour that he wants to leave until next transfer window open we will know
So far some rumors are still linking De Jong with some big clubs, be it Manchester United, Chelsea or recently Liverpool. some rumors link that Jurgen Klopp needs the services of De Jong and will try to bring him in the next transfer window, if Barcelona fails in the champions league, it is a big loss if it drops to the Europa League caste.
De Jong will most likely be released this time by Barcelona, besides he is one of the players who have a big salary, Barcelona still needs large enough funds to stabilize their financial balance. meaning, most likely De Jong, Pique, Alba will be released in the upcoming transfer market.