Needs to think about changing the formation more often. If CHO is playing forget the 5 at the back.
We have a squad of pulisic, havertz, werner, mount, giroud, CHO and Ziyech for crying out loud. 4 of those should be on the pitch
I would take giroud off at half time. Werner through the middle or Mount false 9 (heck even mount false 9 and pulisic left).
Give ziyech 15 -20 minutes with more movement, United sitting further back so he has more time on the ball and see if he improves. If he hasn't take him off