Boss: Defence was key to victory

Sir Alex Ferguson cited the welcome return of a solid foundation as United claimed a slender but significant victory in Portugal.

Rio Ferdinand and Nemanja Vidic earned much of his praise as they played 90 minutes together for the first time since the Reds overcame Inter 2-0 in the previous round of the Champions League - also the last occasion when United kept a clean sheet.

"I think the stability at the back, the recognition of Ferdinand and Vidic together is always a great start for your team," said Sir Alex in his post-match interview.

"There was a lot of good concentration at the back, the team defended very, very well and I think that was key to it really. If we can get back to that foundation of not giving goals away, then we can do well."

United had an aggregate lead to defend from as early as the sixth minute at Estadio do Dragao, thanks to a glorious goal by Cristiano Ronaldo - arguably one of the best of his illustrious career to date.

"It was unbelievable, a magnificent hit, absolutely fantastic," enthused Sir Alex.

"The shot took them all by surprise, coming from 30 yards or whatever it was. The goalkeeper had no chance really."