Fletcher is quickly emerging as one of Europe's best midfielders.
And he told United We Stand: "I don't want to sound big headed, but I've never come up against anyone who has torn me to shreds.
"The only time that has happened has been in training against Roy Keane and Paul Scholes. I do enjoy the big games, I really do. In my younger games, I would perhaps sit back in the so-called lesser games.
"I'd let the lads go and play while covering for them. But in the big games I'd come out wanting the ball all the time. I've had to learn to do that in every game, to do it week in week out.
"I've made a conscious effort in the last couple of years to play every game as if it's my last. If I'm going to stay in the team, I believe I have to play like that. It has worked quite well for me. My whole goal is to win the game and put in a performance which keeps me in the team.
"There is huge competition for places at Manchester United and if I don't have that attitude then I'll not be in the team."