After signing with New York City FC on May 2, 2015, Allen made his debut the next day as a substitute against the Seattle Sounders. RJ Allen went on to tally 13 starts in 14 appearances and contributed 2 assists during the inaugural season for the club.
“It was special; it was definitely special. I enjoyed the moment, but it’s behind me now. It’s not about me, it’s about the team." - RJ Allen on his MLS debut
RJ locked down a regular starting spot in his second season with NYCFC and scored his first MLS goal in a 1-1 tie against the Montreal Impact.