People here think Pep and Klopp will do wonders with the squad without understanding the squad we have and the type of players those 2 want.
Pep and Klopp are commonly mistaken as good tacticians. A good tactician is one who is able to set tactics that make the most of his squad like Tuchel, Mourinho, Ancelotti and Ole. If you pay close attention to our squad, only 3 of Ole's signings are in the first team while the rest are remnants from previous management. Despite our squad being severely unbalanced where we have excellent attackers but a incompetent midfield, Ole has managed to create 3 types of formations to bring the best out of the squad (4-2-3-1, 3-4-1-2 and 4-4-2 diamond).
OTOH, Pep and Klopp believe in systems where Pep is more towards the total football school of thought and Klopp is geggenpressing. In other words, they shape the squads to suit the system rather than setting tactics that can get the best out of the squad. Nothing wrong with shaping a squad to fit the system, but this shows that they are incapable of setting tactics for a squad that does not have the player profiles they need.
The biggest evidence that Klopp and Pep can only work with squads that suit their system is in the number of current first team players bought under previous management. When Klopp won his first trophy (Champions league), only Dejan Lovren, Jordan Henderson, Adam Lallana and Roberto Firminho from the previous management remained as part of the first team where Henderson and Firminho are the only ones to feature more in starting lineup.
As for Pep, he already inherited a squad that had alot of intelligent attacking players such as De Bruyne, Silva, Sterling, Aguero with players like Vincent Kompany, Toure, Fernandinho supporting the defence, central and defensive midfield. It is certainly a squad comparable with the current Manchester United squad and although some of the players were aging, they were still good enough to win the 2016/17 season. Yet he still added 2 goalkeepers (Ederson and Bravo), 2 left backs (Benjamin Mendy, Zinchenko), 2 right backs (Walker, Danilo), a center back (Laporte), a central midfielder (Gundogan), 2 wingers (Leroy Sane and Bernado Silva) and a striker (Gabriel Jesus) to win the EPL and carling cup during the 2017/18 season.
Basically both Pep and Klopp could not make most of the squads they inherited as most of the players did not fit their system. Compare that to Ole who has setup tactics to work with the squad he inherited (more unbalanced than the squads Pep and Klopp inherited) where only 3 of his signings are ever present in the starting lineup (Maguire, Wan Bissaka and Fernandes) and still managed to progress to 3rd and 2nd place in consecutive seasons.