Brommapojkarna youth chief Andreas Engelmark has recalled the late youth development of Viktor Gyokeres.
The Sporting CP striker is being linked with Arsenal and Chelsea at a price of &euuro;100m.
Engelmark told inews: "I think some other players had more technical qualities and were more learned in our system.
Gykeres came a little later and was not a typical Brommapojkarna player like Kulusevski or Ludwig Augustinsson (currently on loan from Sevilla at Anderlecht) were.
"You could see that they had played in our youth academy for many years. Viktor was different."