Amorim said he expects "special talent" Leny Yoro to be in the United squad for the first time against Arsenal, who are second in the Premier League. The 19-year-old French defender was signed in July in a deal worth an initial 62 million euros ($65 million, £51 million) but sustained a metatarsal injury in pre-season and required surgery.
"Maybe Leny Yoro is going to be in the squad," Amorim said. "I felt that he is in a good moment now, his fitness is better, so I think he's going to be in the squad.
"I think he's a special talent. We have to be careful in this first moment because we didn't have too much training together, so he is training not alone but with a small group of players.
"He's really fast, he's a modern defender, and that is good when you want to press high and you leave a lot of strikers, especially in this league, one against one. I think he can manage that. He is very good with the ball, so I am very excited."
Manchester United, who have a poor recent record at the Emirates, are ninth in the Premier League, four points off the top four.