The best time to strengthen a football squad is when it's on top, but not every new player succeeds in a reigning Premier League champion team.
Recent examples show that even big signings can fail to match the team's level, and there's currently a lot of scrutiny on Liverpool's summer spending spree after their title win last season.
While Wirtz is not expected to be as big a flop as Phillips or Drinkwater, the pressure is on for him to perform and justify the investment.
The best time to strengthen is when you're on top
Liverpool's recent results have raised questions about whether they changed too much, and only time will tell if Wirtz will be a success or not.
Author's summary: Wirtz faces scrutiny after Liverpool's summer spending spree.