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Adu, now 31-year-old had gone nearly two years without playing after leaving Las Vegas Lights in 2018 and will now ply his trade in the third tier of Swedish football following Osterlen's promotion from the fourth division.
According to journalist Ives Galarcep, Adu was coaching back in Maryland when he received the offer from the Scandinavian outfit.
Osterlen will be Adu's 15th club in a well-travelled career that hasn't quite played out as he would have liked.
Dubbed 'the next Pele', Adu made his bow in professional football in 2004 after becoming the first pick in the MLS draft and scored his first goal against The MetroStars.
He quickly became viewed as one of the most promising youngsters in world football and a trial with Manchester United a year later added to the buzz surrounding him.
Adu left D.C after two years but remained in the MLS with Real Salt Lake, where his stint incredibly short as he didn't even last a full season with the club.
Benfica came calling and after a deal was agreed, Adu's European football adventure began.
But the Championship and Football Manager legend was never considered a regular in Portugal - evidenced in the fact that he was sent on loan four times (loan spells at AS Monaco, Belenenses, Aris and Çaykur Rizespor to be exact) - with the first loan spell seeing Monaco reject the opportunity to snap him up permanently.
A return to the United States with Philadelphia Union offered him the opportunity to get back on track, with a further three moves doing absolutely nothing for the United States' youngest ever player.
There will always be the feeling that his potential has been unfulfilled but here's hoping he can find some enjoyment in his latest chapter.
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