Speaking after Saturday's 4-0 win over Wigan Athletic, the delighted 23 year-old Dutchman told MUTV: "If I play I want to let him [Sir Alex Ferguson] see that I can do a good job. Today I think I did that.
"I'm happy that I can play my first minutes in the first team. It's great that we won and I scored and gave a pass for Chicharito to score. It's a dream for me."
Büttner found out he'd be replacing the injured Patrice Evra at left-back on Friday but said he didn't feel nervous until the time ticked close to kick-off.
"I was told yesterday I was going to play. I wasn't nervous until I was standing on the field, looking around. I think it's normal to be a little bit nervous if you play in front of so many people.
"In Holland, I played in front of 23,000 so it's beautiful to play for so many more people.
"I'm happy today. I've scored my first goal in my first game and I'll never forget it."