#2 Having depth and versatility in midfield
Liverpool played with a 4-3-3 formation for the majority of last season, and Klopp had a pool of at least 7-8 players to choose from while filling in the three spots in the midfield. Liverpool had the grit of Fabinho, the versatility and experience of James Milner, the leadership and distribution of Jordan Henderson, the speed of Xherdan Shaqiri and the overall utility of Wijnaldum.
As a result, Liverpool could use various combinations in the midfield. They could easily replace an injured Nabi Keita in the final. They could also afford to leave out an experienced and skillful player like Adam Lallana in most of the matches.
Each of the aforementioned midfielders contributed in his own way in Liverpool’s successful Champions League campaign. Fabinho was a pillar in Liverpool’s defence in the final, Henderson made Barcelona suffer with his incessant pressing and Milner had almost scored in the final after coming in as a substitute.