Icardi marked his comeback with a goal last week and Mazzarri reveals he's been taking a special interest in him.
"He is certainly doing better and trained fully. I also spoke to him personally and urged him to surpass his limits in training too.
"It is important that we have competition for places in attack. Ricky Alvarez is eclectic and surprised me, as he has pace and stamina. I didn't think he would."
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