It was ten years ago Alex Ferguson dubbed them the best team he had ever faced but those left from Barcelona's iconic generation still have work to do.
Three remain and when Lionel Messi, Sergio Busquets and Gerard Pique line up against Liverpool on Wednesday, they may wonder if this could be their best chance of another, and perhaps final, Champions League triumph.
Pep Guardiola's mesmeric side had just danced around and dizzied Manchester United in 2009, their 2-0 victory completing an historic treble, when Ferguson conceded: "Nobody has given us a hiding like that."
"How long it lasts and whether they can replace that team...they have the philosophy but it's difficult to say if you can find players like Xavi, (Andres) Iniesta and Messi all the time. Probably not."
"There is a regeneration of the squad that is preparing for the future and I hope to be a part of that."