Inter have struggled in preseason under new coach Mazzarri.
"The first month at Inter has been good for me. We're working very hard and that's what matters in pre-season. Now we're about to start playing competitive matches so we really have to pull out all the stops.
"We still need a bit of time because this is a new group of players and it takes a while to put the Coach's ideas into practice. But even in the games we lost - apart from against Valencia - we did good things.
"We do need to improve at the back. You always pay for even the slightest mistake in defence. We have to get up to scratch quickly now."
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