The 21-year-old arrived on Teesside after a whirlwind 24 hours that saw him first complete a move from MLS side New York City to Premier League leaders Manchester City, before then making an immediate loan switch to Boro, where he will remain for the rest of the current season.

The youngster was viewed as one of the most exciting talents in the MLS, having caught the eye of Man City scouts following two impressive seasons with NYC.

Harrison was born in Stoke and was schooled in the Academies at both Liverpool and Manchester United before heading to the USA as a 14-year-old, where he impressed in High School football and with Manhattan Soccer Club, an affiliate to New York City.

In his debut season, 2016, Harrison was nominated for the Rookie of the Year award and the MLS Goal of the Year Award.  

Harrison, who made his England U21 debut last October, scored 14 goals in 59 appearances for New York City.

The player completed his loan switch to Boro on Tuesday evening before heading across to the Riverside to watch the game against Sheffield Wednesday from the stands.