Abu becomes the latest Ghanaian to be added onto the Crew roaster after signing of defender Jonathan Mensah.
Mohammed Abu made 163 appearances for clubs across Spain, France and Norway, raking in five goals and providing three assists.
“Mohammed is a talented, technical player that we believe will fit well into our system and style of play,” Sporting Director and Head Coach Gregg Berhalter told the club’s official website.
“Across his experience in Norway, France and Spain, we believe that a combination of his experience, skillset and character will be a good fit for Crew SC.
“We are glad to have him in Columbus and it is certainly an added bonus that he is familiar with the area as his wife has lived in Central Ohio.”
Abu has also featured for the Black Stars in the past and was part of the Ghana team that played at the 2013 Africa Cup of Nations.