After coming to the United States in 2005, Nyarko was a star forward and three-time All-ACC selection for the Virginia Tech Hokies soccer team, which played in the 2007 Division I Men's College Cup, falling to Wake Forest in the National Semifinals.

In Nyarko's freshman year, he scored the lone goal of his team's marquee win over then-#4 North Carolina.

Following the 2007 season, in which the Hokies finished #8 in the final AP poll and played in the National Semifinals of the 2007 Division I Men's College Cup, Nyarko was named as a finalist for the Hermann Trophy.

[6] After eight seasons with Chicago, Nyarko was traded to D.C. United on January 6, 2016, in exchange for a second round 2016 MLS SuperDraft pick.

[12] Nyarko made his Ghana debut against Chile on February 29, 2012, at the PPL Park in Chester, Pennsylvania.