Fletcher believes he has the required mental toughness to shine in big games.
“I’m of the opinion that, in the big games especially, sometimes it’s more psychological than about actual ability,” he told the Daily Mirror.
“I’m a great believer in that. A very big percentage of the game is played in your head and how you deal with the big occasions. I just relish that challenge.
“The biggest part of being at this club is how you handle it mentally. I’m one of those who wasn’t going to hide away if I got criticised, or shirk my responsibility.
“You’re constantly being challenged at United. I want to be here for the rest of my career and leave some mark on the club.”
Fletcher alos commented on their opposition on Sunday.
“We know they’re a very tough team. They’re a proper British style team, they’re in your face, they close you down and they work ever so hard,” he added.
“They have so much pace and quality on the counter-attack that it’s something we’ll have to be wary of.”