The midfielder missed this week's disappointing 1-1 draw with the bottom-of-the-league Wolves.
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Delivering an update on the England midfielder, Amorim stated before the Wolves draw: "He felt something, but I think it's small, I think it's not going to take a long time, but we never know.
"He's not ready for this game, but let's focus on this game."
United go to Leeds United on Saturday.