The 24-year-old has scored 11 goals in 17 outings across all competitions since arriving at Old Trafford from Everton in the summer.
"I've improved my movement, especially in the box," he told DH.
"You need to sit down and watch the Uruguayan's movement inside the box. It's incredible.
"On top of that, I worked three times a week on my runs inside the box with my coaches."