The Red Devils recorded their lowest ever Premier League goal tally last season and Mourinho believes the arrival of the 27-year-old will help avoid a similar feat.
“He has a change of speed with the ball and without the ball, and that is very, very important for a club like ours.”
Mkhitaryan is the third man to have joined United since Mourinho replaced Louis van Gaal as manager in May.
And the Portuguese boss believes he is on the way to creating an elite squad at Old Trafford having already secured the services of Eric Bailly and Zlatan Ibrahimovic this summer.
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