The Nerazzurri earned a 4-2 victory at San Siro, though had gone 2-0 up in the opening nine minutes.
Mateo Kovacic was one of those Mazzarri singled out for 'showing off' when the result was still in the balance.
"Mateo is in a new position and is still learning what he has to do there, improving after the first half. Unfortunately, some of my players get fired up and want to do something spectacular rather than what is effective, which you can't afford at this level," rapped Mazzarri.
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