Capello, who coached Juventus in the past, thinks that Luiz has the potential to be a good player. He believes that the midfielder may not have been given the right conditions to perform at his best. Capello also mentioned that other players, such as Nico Gonzalez, may also be struggling to integrate into the team.

Capello pointed out that Juventus invested a significant amount of money last year to sign players, including Luiz, Gonzalez, and Teun Koopmeiners. However, it seems that these players have not managed to meet the team's expectations. Capello is concerned that if these players leave the team, they may become what they were not while at Juventus.

In essence, Capello is highlighting the need for the team to take a step back and re-evaluate its approach to developing its players. He wants the team to consider the potential consequences of letting talented players leave and become something they are not.