Asked what Mourinho had said before sending him on, England international Rashford told Sky Sports: "He just told me to stay wide and get at the full-back.
It is tight between second and sixth and we need to keep winning every match
Marcus Rashford
“I did that and followed those orders.
“As soon as I looked up (Mata) was the option and I was just pleased he finished it. It was a big three points.”
Zlatan Ibrahimovic scored United’s second to move Mourinho’s men to within one point of fourth-place Arsenal.
GETTY
Rashford (left) set up Juan Mata score the first goal at London Stadium
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REUTERS
Mata scored just four minutes after Rashford entered the field
Juan Mata gives the lowdown on 'special' Marcus Rashford
And Rashford is confident United can make it into the Champions League places.
"We are in and around the top four,” he added.
“It is tight between second and sixth and we need to keep winning every match."