The young Gers, who are the only B team left remaining in the competition, are aiming to setup a last four clash with East Kilbride by overcoming the Championship club at The City Stadium.
Speaking to the media in this afternoon’s press conference ahead of the match, the midfielder said: “Manager's message? He has just told us to believe that we can win, from the first minute to the last.
“Anything that happens it doesn't really matter we just work hard even if the result doesn't come our way we still work hard, to be relentless and just never give up and just try make it a game that we can actually win.
“Today in training, we have just said to train like how we'd play tomorrow, which is aggressive and showing them that we are a team that can give them a lot of competition and hopefully we get a result.”
David McCallum’s side have already overcome the likes of Bo’ness United, Clyde and Fraserburgh in their journey so far, but the 18-year-old is expecting their toughest test yet as he spoke of what it would mean to pick up silverware this season.
He continued: “The games so far? The first one was kind of a walk-through but throughout the competition, it has got harder and harder.
“We have just been pushing and working together as a team to go through every game together and be relentless and just never give up.
“It has got us to the quarter-finals against a good opposition, Queen's Park who are a Championship team and will give us a good game tomorrow.
“It means the world; this would be my second trophy for this club so it would mean something big for me and my career.
"My first one was the Scottish Youth cup final, that was last season and that really touched me.
“I have always been a winner, always loved winning, it has always been my passion; I hate losing so hopefully we win this cup.”
Nsio was part of the squad that travelled on the first team pre-season training camp in the summer and says that opportunity as well as getting the chance to play against senior pros, has helped his development as a player.
He added: “It was a big leap because I wasn't really expecting it but when I went I really enjoyed it.
“I really learned a lot from the senior players and the coaches, ever since then I have just taken their advice every game and training session that I have been in.
“I was pleased that I went because I really learned a lot.
“It really helps because Queen's Park are a Championship team.
“A very strong team and as we develop that is the kind of games that we need for when we do go to first-team clubs and play so we can understand the physical and mental side of playing football against men, it is very good that we are playing them.”