Olosunde joins on a two-year deal after being released by Manchester United. He never appeared for the United first team and spent the 2018/2019 season with the U-23 side.
Olosunde had been linked with a loan move to his former youth club, the New York Red Bulls, in the summer of 2018 but this move failed to materialize.
Rotherham spent last season in the Championship but was relegated after finishing 22nd (out 24). It conceded a league-high 83 goals in 46 games. Rotherham has been a “yo-yo” club in recent years, having bounced between League One and the Championship since the 2013/2014 season.
Olosunde’s primary completion for the starting right back job will likely be 32-year-old Billy Jones (21 appearances last season). Last season was Jones’ first with Rotherham.
Olosunde was a long-time U.S. youth international appearing for the U-17 and U-23 sides before making his senior USMNT debut in a May 2018 friendly against Bolivia.