Cristiano Ronaldo hailed his return to his homeland as "the perfect night" after firing United to victory against his former club.

The Portuguese international headed home Wes Brown's cross just after the hour to give United a priceless victory and set them on their way in Group F.

Ronaldo was pleased with the result, but admitted that he felt a tad guilty about netting against the club he calls his second home.

"It's a perfect night for me. I scored and the team won. So it's been a great night for me and United," he told Sky Sports at the final whistle.

"It's always important to win away from home. Both teams played well, but I think the result is a fair one because we did better.

"Red is my colour and I want to win for United. I said before the game that Sporting Lisbon is my second home and I feel a little bit sad [that they lost], but the most important thing is United. They are my team and I'm very happy with the victory."

Some sections of the home fans rose to applaud Ronaldo's goal, before the whole stadium gave him a standing ovation when he was substituted in the final few minutes. It was a gesture which delighted the 22-year-old winger.

"The people here are very important to me," he insisted. "They helped me a lot when I played here.

"When I scored I didn't want to do too much because I don't think it's fair. But I'm very happy with the three points."