The summer arrival from FC Zurich played in the previous rounds at Burnley and Leicester City and has been made aware of the tournament's prestige by Under-18s coach Paul McGuinness. After performing well in the Under-21s' victory over at West Ham at Old Trafford on Monday, he is expected to be involved in Friday's tie at Huddersfield Town.
"It's always difficult to prepare in your mind for the different levels but the FA Youth Cup is very important for the club," he admitted. "It is a big opportunity to show myself as well and, if I can help the team, then it is good.
"Paul has explained the history of the competition and now it has sunk in. In the first game, at Burnley, I didn't really realise how important and big a competition it is but now I think I know it a bit better."
The right-back, who can also play further up the field, did well in the Europa League earlier in the campaign and attracted praise from Paul Scholes for his performances in the Under-19 competition.
"Saidy has been fantastic since he came in and looks a bright prospect for the future," enthused Reds legend Scholes to Inside United. "Hopefully he's on his way to the first team."