After Sir Alex Ferguson endured a "nightmare" Monday, when both Anders Lindegaard and David de Gea were ruled out, Amos was thrust into the spotlight for last night's Premier League win over Stoke.
Now attention turns to the weekend when, after joining Man City at the top of the Premier League, United must try to stay there by beating Chelsea on their own patch for the first time in the league since 2002.
Although Ferguson did not offer an update on Lindegaard or De Gea, neither man was included in a list of those who have a chance of being fit for the weekend, which means Amos may be plunged into the biggest game of his life.
"I have been waiting a long time for an opportunity this season and thankfully it has come," said the 21-year-old.
"I feel I am ready to play at this level and it has been kind of frustrating that these chances don't come around.
"But you have to be ready when something like that happens and you are thrown straight in and I like to think I made the most of it."
The only time Amos was threatened was when he smothered a Cameron Jerome header at the second attempt.
However, the fact he didn't force himself into the action was a good sign as, just as a striker may snatch at chances because he knows they must be taken, so keepers can underperform by trying to create work when there is none.
"In a sense I wanted more to do but then there is a temptation to go and chase things," he said.
"You see a lot of keepers with not much experience who try and make an impact, which there is no need to do. That is what I had in my head and I think I got that right.
"Obviously I wanted to be positive with any decisions."
After spending half a season on loan at Oldham last year, it was anticipated Amos would spend more time away from Old Trafford, but he stayed with the Reds, featuring in all three Carling Cup matches earlier this season.
"All I can do is keep a clean sheet and play the best I can when I get a chance," he added. "You have to do the best you can.
"It is the manager who makes the decisions and all I can do is put pressure on the other two any chance I get." Tweet

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Stamford Bridge and cauldron are two words that don't go together in my book. Ben will handle it fine. Another 3 points loom.
hope De Gea is fit personaly myself but if we go with Amos he needs a solid stable defence in front of him!!!!
Will anybody here explain to me why our players get KOd so easily? Shouldn't we be cranking pressure on someone to come clean on this matter?
a few suggestions
make sure dea gae is not in goal
play our best right back rafael
go 4-5-1 with welbeck wide left
carrick/scholes/jones central midfield
rooney up top
LEAVE PARK back in manchester
Egg and chicken with De Gea - do you play him and hope he gets his confidence back and hope he doesn't drop another one and get worse or leave him out for a while.
This decision, I must admit, is a loser to nothing.
I think he'll be fine down the road but not sure when 'down the road' is.
My decision would be to not play him against Chelsea, too risky for United and him.