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Legend though he is, Cambiasso needs to make room for younger players that suit Mazzarri's needs.
One of the biggest knocks on Mazzarri is his slavish devotion to his three-man defensive tactics. Indeed, for a large chunk of the year Mazzarri, played no formation other than a 3-5-1-1—only a slight modification of the 3-5-2 that he had so much success with at Napoli.
Compare that to Serie A's current standard-bearer, Antonio Conte—who has changed his tactical system to fit his squad's best talents twice since he arrived at Juventus and looks primed to do so again this summer—and Mazzarri looks stuck in the mud.
It's something of a wonder that Inter has been as successful as they have been without a compliment of players that fit into the counter-attacking style that Mazzarri made famous at the San Paolo. Aging pieces like Esteban Cambiasso and Javier Zanetti, though club legends, don't have the legs to play the type of game Mazzarri wants to play. Diego Milito was vital to 2010's treble but can't stay on the field long enough to make an impact. It's questionable whether any of the center-backs he has on hand can play in a three-man line at full effectiveness.
For Mazzarri to truly make this side click within his system he needs players tailored to it. Thohir started things rolling for him this winter when he purchased Hernanes from Lazio. The Brazilian can play the role Marek Hamsik played for Mazzarri at Napoli—something he was sorely missing in the beginning of the year.
He needs more. With European competition back on at Inter this season, the midfield will have to be reinforced with multiple bodies—either from the team's talented youth system or elsewhere—in order to have the necessary depth and quality. He'll need at least one more forward—hopefully a revitalized Ishak Belfodil but possibly another option—to back up Rodrigo Palacio and Mauro Icardi. If Icardi, whose childish feud with former teammate Maxi Lopez got old very quickly, is offloaded to rid the dressing room of his nonsense, he'll need more than that.
The fact that Mazzarri has jumped four places with basically the same squad from last year is astonishing. If he gets players who are of greater quality and who are better fits for his system, things might develop even quicker than most thought.