#5 United must sort out their defending during set-pieces for Arsenal
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Though United ran out comfortable winners, an aspect of weakness Mourinho must correct at the training ground will be the approach to defending set-pieces. The freedom provided to Mark van der Hoorn to emerge from the crowd of players and head in Gylfi Sigurdsson’s free-kick completely unmarked may not have cost United this time.
With Arsenal heading to Old Trafford for the next league fixture, however, the defence must sort themselves out and assign stern man-marking duties while defending set-pieces. Similar mistakes against teams of the quality of Arsenal are bound to prove costly and Mourinho will hope that that is not his undoing when he goes head-to-head with his age-old rival in Arsene Wenger.
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