The 17 year-old is the talk of Europe. Here's what some in Sweden have to say about the 'new Zlatan Ibrahimovic':
Henok Goitom (striker, San Jose Earthquakes): "If you educate Alexander Isak, in a good way, he can have a big future. He already has a good understanding of the game."
Tobias Ackerman (AIK scouting director): "Even when he was 10, he had an extremely developed game. He had nice feet and fine qualities in this way. Properties that you look at and that can help you to become a good player as a senior.
"You put a 14 year old talent to train with the U17 team and he is performing above expectations there. Then he goes on to the U19 team. No one believes he will succeed there, but he just continues to fly.
"Same thing with the U21, and with the first team."
Peter Wennberg (AIK assistant coach): "Everyone who worked with Alexander Isak during adolescence have known that we will be sitting there one day and see him deciding a derby. It feels natural to see him deciding a derby."
Bjorn Wesstrom (AIK sporting director): "I have no comments on the clubs, but I can confirm that we have been approached by teams in the Premier League, La Liga, Bundesliga and Serie A. These are no small clubs we're talking about so it's obviously flattering."
Patrick Mork (agent): "He is an exceptional and extraordinary talent. Name five of Europe's biggest clubs and there are four who want him. There was a huge interest in the summer for him. If he actively wanted to leave AIK, he would already have been sold."
Chinedu Obasi (striker, AIK): "He is a great talent. He has great potential, and I absolutely believe that he will go far. I do not want to say too much, but I think he has much potential.
"If he has the drive and continues, I think he can become Sweden's next (Zlatan) Ibrahimovic . He has the potential, everyone can see it and he proves it all the time."
Nicklas Barkroth (attacker, IFK): "I can recognize myself in that I played for a big club at that age. But he seems to be a pretty cool guy who focuses on himself. It's fun to watch and good for Swedish football.
"It will not always be so easy and there will be setbacks that he must be prepared for."
Ricard Norling (AIK head coach): "He has a terrific talent, but you can't compare him to Zlatan ... He's not there yet, but the important thing for him is to make sure that he's doing something to bring out the talent that he has been gifted with. And I can tell you he works hard every day."