They played Partizan Belgrade, not Viktoria Plzen, if that is what you thought. United have largely played the same core XI with few changes here and there from game to game.
They played a strong team against us because it was us, a big team. Their XI at the Bridge was stronger than when they played Rochdale in the previous round.
vs Rochdale
Romero, Wan-Bissaka, Tuanzebe, Jones, Rojo, Fred, Pogba, Pereira, Lingard, Chong, Greenwood
Subs - Williams, Mata, James
vs Chelsea
Romero, Lindelof, Maguire, Rojo, Wan-Bissaka, McTominay, Fred, Williams, Lingard, James, Rashford
Subs - Martial, Pereira, Young