Ninety scouts watched in-demand AIK Fotboll forward Alexander Isak during his club's 1-0 defeat to IFK Goteborg on Monday night, according to a report.
The 17-year-old, who has been likened to Manchester United forward Zlatan Ibrahimovic, has scored nine times for his Swedish club this season.
Real Madrid, Barcelona, Liverpool and Bayern Munich have all been linked with the teenager and last month, AIK's sporting director Bjorn Wesstrom warned interested parties that it would take a sizeable offer to tempt his club into a sale.
According to SportExpressen, Manchester United, Chelsea and Borussia Dortmund had scouts in attendance, while Barcelona, Real Madrid and Bayern were also represented in the stands.
Isak, who is contracted to AIK until the summer of 2018, has also scored twice in six appearances for Sweden's Under-17 team.