The Red Devils will now play four games in a week after their clash with Liverpool was re-scheduled to May 13.
But Portugal international Fernandes has no intention of asking Ole Gunnar Solskjaer for a break.
He told United's official website: "For me, the most important [thing] is playing. When the coach wants me, it's important to know I'm ready to play every game, every minute.
"I will never say I'm [too] tired to play because this is my dream. I will never be tired to play.
"When I was a kid, I played maybe seven or eight hours a day. So, to play 90 minutes every three days or two days is not enough for me."