چگونه کالافیوری به "بهترین دفاع چپ لیگ تا کنون" تبدیل شده است

How Calafiori has become 'the best left-back in the league by far'

Riccardo Calafiori returns to Italy with Arsenal this week - and he's a very different player compared to the one who departed for England two years ago.