Frank De Jong again? That guy had good chances of going to England teams, especially to Manchester United but he chosed to play in Champions league because Manchester United is playing in europa league. In short time he will also see himself in the Europa League

. If he sees any good offer by January he may leave.
In the previous transfer window, he has an opportunity moving to Man United but he refused it since Barcelona still didn't pay all his salaries. As far as I know, the reason was about the salary, not about Man United not playing in UCL. Sure, he finally will play in Europa League also because Barcelona seems hard to qualify for the next stage in UCL.
Frank De Jong is no longer a key player for Barcelona, he spends much time on the bench now. No doubt that he will leave Barcelona if there is a top club makes an interesting offer. Barcelona also needs fresh money to balance the players' salaries. So, it will be good both for De Jong and for Barcelona as well.
Although I support him 100%, Under Xavi's management, Frank De Jong has lost his role as a key player for Barcelona, which is an unfortunate.
Frank De Jong was benched by Barcelona, and it didn't work out well. De Jong is extremely upset about not starting matches and may leave FC Barcelona if things do not change. Leaving would be better for him, but he refused earlier after making so much controversy. The upcoming January transfer window is a great opportunity for him to move to a better place when he gets enough playing time and he doesn't make any excuses for not moving.