What is this nonsense? The guy is notoriously unproductive.
The way some people talk about him you'd think we're looking Obertan or Bebe level here, yes Lingard has dipped off for the last couple of seasons, probably got a bit big for his boots, thought he was better then he is, etc, but there's also been bits in the media as what might have contributed to it also, it's sad how it's sprialled downhill for him really, but there's easily time to turn it around.
He has unquestionably played well for us in the past, has been picked by every United manager, and has a decent load of games for England, I'm not sure what the issue is with him, if we don't want him in the summer we can sell him, they'll be plently of takers at the right price.