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Zanetti says Inter has full faith in Simone Inzaghi and believes he can mount a strong challenge to regain the Serie A title.
The Nerazzurri were dethroned by city rival AC Milan in Inzaghi's first season in charge after the head coach was lured from Lazio on a two-year deal.
Inter is seventh on the table after losing 3-1 at Udinese in its final game before the international break.
That was its third Serie A loss in seven games this season and it was also beaten 2-0 by Bayern Munich in the UEFA Champions League at San Siro.
Inter vice-president Zanetti says the hierarchy has never had any doubts that Inzaghi is the right man for the job.
He said: "There has always been confidence in Inzaghi, the merits are never of just one person.
"There is a group that has very clear objectives and we are all going in the same direction."
Former Argentina captain Zanetti expects Inter to be a force this season despite an unconvincing start.
He added: "We must be a resilient, humble team, and then it will depend on our ability to be protagonists because I am convinced that there are the conditions to be able to do so."
Inter returns to action with a Serie A encounter against Roma next Sunday (AEST).