The Ghanaian midfielder joins from Norwegian club Stromsgodset IF as a special discovery player.
The Columbus Crew have signed midfielder Mohammed Abu, the team announced Tuesday.
The 25-year-old Ghanaian joins from Stromsgodset IF as "special discovery player", meaning his transfer costs are spread out across the lifetime of the contract. Official terms of the deal were not disclosed.
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“Mohammed is a talented, technical player that we believe will fit well into our system and style of play,” Crew head coach and technical director Gregg Berhalter said in a press release.