Klopp joined Liverpool in October 2015 with the club 13th in the PL. Having inherited Brendan Rodgers' squad, he saw them finish the season in 8th. To rebuild, FSG made wholesale changes from the front office to the first team, and they experienced their fair share of poor form.
Despite having a clear idea of which areas of the team needed strengthening (in particular, defense), it obviously didn't happen Immediately. Liverpool finished the 2016/17 season in 4th place, having conceded the 2nd most goals of any team in the top 7.