Tottenham manager Harry Redknapp concedes “Milan made it difficult for us to get near them with that fantastic ability in their team.”
The 1-0 first leg victory proved crucial, as the Rossoneri dominated at White Hart Lane, but were unable to break the deadlock.
“It's a great night for the players, the fans and everyone. We're delighted,” he told ITV.
“It was hard work out there tonight, Milan are a good side and you can see why they're a great club with the tradition of winning the Champions League.
“They showed it tonight, coming here with players like (Clarence) Seedorf and (Alexandre) Pato; it's so difficult to get near them with that fantastic ability in their team.
“We worked our socks off, stayed with them and it's a difficult situation when you come home with that 1-0 lead. You try to protect it, but at the same time want to go for broke and are aware you need to keep hold of that.
“We were out-numbered in the middle of the park. They had Seedorf in that spare role, they narrowed up, had extra men in there, passed it around in midfield and made it difficult for us to get near them.
“I enjoyed the occasion, but I couldn't say I enjoyed the 90 minutes. You look at the clock and want that 90 minutes to be up.
“It's a great achievement for this club to be in the last eight of the Champions League. If people can't appreciate and enjoy this tonight, then they shouldn't be involved in football.”