I. Casillas refuted J. Mourinho's comments about the end of his career

"Porto" goalkeeper Iker Casillas waited for the right moment and took a shot at recently criticized Jose Mourinho. Between these two men, a black cat crossed paths while both were at the Madrid "Real" club. Not long ago, J. Mourinho stated that I. Casillas, from his interview, reminds him of someone approaching the end of his career. The Portuguese also mentioned that criticism of David de Gea in Spain is related to Iker Casillas' comments about returning to the national team. I. Casillas finally decided to go after J. Mourinho himself. The goalkeeper did this immediately after the match when "Manchester United" lost to the "Liverpool" team. According to a Portuguese newspaper, as mentioned by a certain person (Mourinho - editor), a player, at 37 years old, is close to the end of his career. I completely agree with that! My question for the same newspaper would be: when it comes to coaches, when and at what point do they realize they can no longer train a team? - wrote I. Casillas on his Twitter account. According to a Portuguese newspaper, someone said that a player like me (37 years old) is at the end of his career. Completely agree! My question for that newspaper: In the case of coaches, when and at what moment do they realize they are no longer fit to manage a team or train? - Iker Casillas (@IkerCasillas) December 16, 2018