Career
Born in the London Borough of Westminster, Romeo joined Gillingham in the summer of 2012 on a two-year scholarship, having previously played in the youth systems of Arsenal and Wycombe Wanderers. In January 2013, Romeo joined Conference South side Dover Athletic on a youth loan. He made his debut in a 5–2 away defeat to Farnborough.
He made his professional debut for Gillingham on the final day of the 2012-2013 season as the Gills were crowned champions of Football League Two, a 3–2 away defeat at Burton Albion.
In the summer of 2015, he signed for Millwall and featured regularly in the first team by the second half of his first season with the Lions.