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Every great, successful team has had depth. Barcelona and Real Madrid often have a bench full of world beaters, meaning Atletico Madrid will need to be deep as well if they want to win the La Liga title.
Everyone's definition of depth is a bit different—allow me to clarify.
For many, the word depth refers to how good the players are that are not regular starters. For this discussion though, we are using the word depth to refer to how close in quality the entire squad is to one another.
By this definition, there are very few squads in the world that are as deep as Atletico Madrid.
For instance, Barcelona boast a roster full of stars. However, the team will not be nearly as effective with Sergi Roberto in the middle of the pitch in place of Xavi or Iniesta, nor will the attack be as dangerous with Lionel Messi or Neymar out of the squad. The reserves may be terrific players, but the play suffers without regular starters.
However, when someone is not in the lineup for Atletico Madrid, the player that takes his place is normally very similar in quality and does not cause the dynamic to suffer.
Role players such as Raul Garcia, Cristian Rodriguez and Oliver Torres may not be first-choice starters, but the team barely misses a beat when they stand in for others in the lineup.
Depth has little to do with how good a team's bench is, rather, it is all about how balanced a squad is as a whole. Based on this, Atletico Madrid are as deep as they come and are in it for the long haul.