Chelsea always feels so difficult to beat United even when their opponent in the shitty season (h2h). However, they may get more motivation to keep UCL spot in their hand, and must get three points from MU. Three points from MU is very very very important to keep up their chance to qualify for UCL next season.
The odds literally says almost zero chance for MU to be up in this game, but often saw MU performed differently in the important game. They have to smash MU, or they will miss UCL.