That's because he had played well.
Bentaleb had already made at least 2 of those that went unpunished in safer zones but didn't learn and even his jog back was uninspired given that he had fucked up. Poor Nabil went on to make another couple stray passes so clearly he's not on today.
I don't think he's someone who will slump if criticised, so Poch should replace him and get him to work harder. The team has many other young options who could replace him if he continues his complacent passing. Man U might be droll today but that doesn't mean you don't turn up. I know we are far from being champions but just a little more composure and really taking it to these teams would do well for the long run, instead of turning up, mentally crumbling and allowing them to get away with playing shite and taking all three.
It's a big risk but the drive of Alli through midfield could be the weapon to hurt them...