Since we've just bought Lingard's replacement, he should be sold in the summer. Pereira is on much lower wages so finding a replacement for him, without increasing our already huge wage bill, would be very difficult. Andreas may yet improve so I'd be content to keep him for another year or two, as a back-up player.
To state the obvious, neither of them has performed at an acceptable level this season, though Pereira has been slightly unlucky, in that some of the big chances he has created, haven't been taken.