He ended last season with eight goals, four as a sub, in 22 games in the Bundesliga.
"If Luka carries on like this he will be a world class player, he's one of the best in Europe at his age, he can score with his right, his left, his head, he's complete," Kovac responded in admiration.
From 17 goals in all competitions this season, adding five from the Europa League where he is the second top scorer, eight have been with his left, seven on his right and two with his head.
All of that on top of a sky high conversion rate in front of goal at 29.3 percent.
"He's a hunter, he scores four of every five chances," his new coach, Addi Hutter, said.
Team-mate of Lucas Torro
He plays alongside Spaniard Lucas Torro at Eintracht Frankfurt and he could not hide his joy in having such talent in the line-up.
"He's a brilliant striker, he's not the typical number nine, he's more mobile," the former Real Madrid, Real Oviedo and Osasunamidfielder said.
"He has some spectacular features: it seems he's not quick, but he is, he's strong, technically very good, scores and fights a lot.
"He has enormous potential."
Those complements are echoed by another experienced player in ex-Milan midfielder Kevin Prince Boateng, who now plays for Sassuolo having left Frankfurt.
"He has football in his blood, he's a street player who has a smell for goal," Boatengsaid.
"You have to be careful, but he has what it takes to be a world class star," said his coach Addi Hutter.
Jovic's highlight this season undoubtedly came against Fortuna Dusseldorf, where he scored five goals in a single game to become the youngest player ever to do so.
"I haven't managed that since I was 12-years-old," Jovic joked after the game speaking to Bild.
"I believe in my abilities, but I didn't think this year would be so good.
