Signed on September 14, 2018.
2019: A mainstay on the backline, Onuoha started in 28 of his 29 appearances in his first full season with RSL. Playing 2,516 minutes, Onuoha recorded 25 tackles and scored one goal.
2018: Arriving late in the 2018 season, Onuoha played in five matches for RSL, including all three playoff matches the club faced in the 2018 Audi MLS Cup Playoffs.
OUTSIDE MLS: Onuoha was born in Warri, Nigeria, and raised in Manchester, England, rising through the Manchester City youth system before making his professional debut at 17 years old for City in 2004. He would go on to appear in 95 league matches for Manchester City and spent one season on loan to Sunderland, where he played in 31 matches, before making the move to Queens Park Rangers. With QPR, he played in 207 matches from 2011-2018, captaining the club starting in 2015. Of his 333 career league matches in England, 188 came in the Premier League and 145 in Championship.