Bayer Leverkusen playmaker, a big-money target for Chelsea this summer. The nickname was coined by German sports media giant Bild as the 19-year-old attracts attention from Europe.
And according to mlssoccer.com, Celtic have joined an unnamed Belgian club plus a queue of Bundesliga sides in tracking the midfielder.
Hoffenheim, SC Freiburg, Eintracht Frankfurt and Borussia Monchengladbach have all been credited with an interest in Aaronsen.
He's contributed a goal and two assists in five appearances since MLS restarted. Philadelphia boss Jim Curtin recently revealed he expects big things from the youngster this season."Overall we've challenged him from last season...
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