"To start at the Calderon has been my dream since I was little and it will be very good," said the 18-year-old. "I started with a summer that was a bit shaky and I have now had the fortune to be able to make my debut.
"It's a dream for me to make my debut at Atletico Madrid, above all in the Champions League.
"It was hard for me to sleep that night because of the emotion I had been through."
It will be a baptism of fire for De Gea as he lines up behind the leakiest defence in the Primera Division, with Atletico having shipped 13 goals this season.
However, he is confident they will turn things around sooner rather than later.
"The team are confident," he continued. "We are hurt by the defeat and because the results aren't coming, but the team is going to look ahead united to get out of this situation.
"We are all very conscious that we have to look ahead and all be united.
"The team are confident that we will start winning from now on."