#4 Marcus Rashford
Having secured a vital advantage for United in their away tie against Celta Vigo with a superb free kick, Rashford returns to Premier League duty in sublime form. Although controversially, it was Rashford who won the penalty against Swansea as well. Rashford has had a hand in all the European goals Manchester United have scored since the quarter-final stage.
It has been a timely step up in the absence of Ibrahimovic. Against Arsenal's three-man defence, Rashford's impact in occupying the centre-backs will determine how much space the players around him will have.
It was just over a year ago that an untested Marcus Rashford burst into the scene with two goals and an assist against Arsenal. He has come a long way since then; Arsenal defenders will probably know better this time around.