The Dinamo Zagreb teen is set to join Barca at the end of the season.
Peternac, who played with Halilovic's father, told Sport: "He's the closest thing to Andres Iniesta and hopefully will prove this.
"He has a good touch and great value with the ball, driving, playing, scoring goals. For me, he's just like Iniesta.
"Alen has great quality. The family lives for football, they have three children. At home, it's 24 hour football. Since he was little, he's had the ball at his feet and played very well."
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