|Date of birth||January 31, 1989|
|Place of birth||Bwiam, Gambia|
|Height||5 ft 9 in (1.75 m)|
|2001–2004||Gambia Ports Authority|
|2004–2007||Gambia Ports Authority||82||(18)|
|2007–2013||New England Revolution||104||(8)|
|* Senior club appearances and goals counted for the domestic league only and correct as of November 10, 2014.
† Appearances (Goals).
Nyassi was scouted by New England Revolution head coach Steve Nicol while playing in the 2007 FIFA U-20 World Cup, and signed with the Revolution shortly thereafter along with his Gambian teammate, Kenny Mansally.
He made his MLS debut on September 9, 2007 against D.C. United as a substitute, playing the final eight minutes on the right wing. He made his first start and scored his first MLS goal on March 29, 2008 in the Revs' 3-0 opening day victory over Houston Dynamo.
Nyassi has represented his nation at various youth levels. He played for the Gambian U-17 national team in the 2005 U-17 world championships, and for the U-20 national team in the 2007 U-20 FIFA Championships. He scored his first goal for the Senior national team on September 4, 2010 in the 2012 Africa Cup of Nations qualification match against Namibia.
|1||September 4, 2010||Independence Stadium, Bakau||Namibia||
||2012 ANC qualification|
New England Revolution
- Lamar Hunt U.S. Open Cup (1): 2007
- North American SuperLiga (1): 2008
- Lamar Hunt U.S. Open Cup (1): 2013
- "Nyassi Set to Sign with the Eddies". February 10, 2015.