With thirteen minutes remaining, the Brazilian scored a sublime goal from the edge of the box to give United all three points.
Speaking after the game, Fred told MUTV: "It's always good to score in a game, but today we win 1-0 and it's nice that my goal can be so important.
"Of course, above all, the most important thing is the win to help the team. It was a good performance, we played very well and kept a clean sheet too.
"With it being the first game with our new coach it is so important for us to keep things moving day after day and be ready for the next game."
He added: "With me being left footed, sometimes I try (to shoot) with my right.
"Mason gave me a good ball and in that moment I just looked for the goal and it happened. I'm very blessed and so happy to score one more goal here at Old Trafford, in front of our fans."
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