The England international headed the priceless away goal in the Spanish capital and has since played his part in the victories over Reading and QPR. Indeed, he won possession in the build-up to Ryan Giggs' victory-sealing goal at Loftus Road after replacing Robin van Persie as a substitute.
Welbeck told ManUtd.com and MUTV: "It was a great feeling to get a goal at the Bernabeu, especially because of the whole occasion with all our fans travelling over and with it being such a big game.
"It was a big goal - probably the biggest goal I've scored. It's something you strive for since being a little kid. Playing for Manchester United in one of the biggest games made me feel proud and it gives you motivation to strive for more."
Although the Champions League second leg is only a week away, the players are fully aware that Saturday's Barclays Premier League clash with Norwich City currently takes precedence. The first target will be to extend the Reds' lead at the summit again, after Manchester City cut it back to 12 points with victory over Chelsea.
"The manager and coaching staff keep reiterating the fact that the next game is the most important," explained Welbeck.
"I think the whole squad has got that into their heads and we've all got the same mentality of going into the next game and needing to win to gain momentum.