United won this preseason friendly 4-1 on Wednesday night in Chicago, with Williams scoring their final goal.
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Afterwards, Amorim admits he was especially pleased for the youngster.
He said, “I celebrate that goal. It's not usual, even during the season, but I celebrate that goal, because I really like to see the kids that work really well.
"They didn't have a lot of space during trainings, but still they are there, they understand the idea, they pressed, they fight. So I'm really pleased with them.
"They control the game. They try to score more goals, so I'm really pleased.”
Williams spent the second-half of last season on-loan with Cheltenham Town and is a nephew of former Manchester City goalkeeper Alex Williams.