Because of his performance with the Rush, Manneh was named to the 2010 Disney's Soccer Showcase All-Star Team and was given a week-long training stint with the Chelsea F.C.

[6] Despite successful trials with top clubs in the Gambia, Manneh decided to move to the United States and join the Texas-based academies.

[1] In 2012, it was reported that Manneh was on trial with the reigning Major League Soccer champions, the Los Angeles Galaxy but was ultimately not signed to a contract.

[6] In January 2013, Manneh signed a Generation Adidas contract with Major League Soccer in order to take part in the 2013 MLS SuperDraft.

Vancouver made a trade with Toronto FC involving swapping picks and allocation money to get an earlier selection in order to draft Manneh.

[9] On 3 March 2013 Manneh made his league debut for the Whitecaps, starting the match and playing 45 minutes of a 1–0 opening-day victory over Toronto FC.

[13] Following a string of impressive performances in October 2013, it was reported that English Premier League powerhouses Chelsea, Arsenal, and Liverpool were in the hunt to sign the 18-year-old from Vancouver, with the latter apparently linked with a move for the player the previous summer.

[20][21] On 13 February 2019, Manneh returned to the United States, joining FC Cincinnati ahead of their inaugural season in MLS.

[26] On 7 February 2022, it was announced that Manneh had signed with USL Championship club San Antonio FC ahead of their upcoming 2022 season.

[29] Because of Manneh's performances with Steve Biko FC, he was called up for the Gambia's U20 national squad for the 2011 African Youth Championship in Tripoli, Libya in March of that year.

[34] While playing for the Canada-based Vancouver Whitecaps FC, Manneh lived in the U.S. exclave of Point Roberts, Washington in order to fulfill his residency requirements for U.S.