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

.
Not only do Manchester united went for him during the transfer window open, Chelsea was the last club that was almost at the point of getting him before the transfer window close, Players knows what is best for them and I think that Frank De Jong took that decision that base on his interest and love for Barcelona and help rebuild the team and make it great again. Therefore still not very late for Barcelona to turn things around and become strong again. However still rumour that he wants to leave until next transfer window open we will know