[1] After spending his first professional season in Spain with Viña Costeira, Vassell signed with KR of the Icelandic Úrvalsdeild karla in January 1998.

[6] He split the 2003–2004 season with KTP Basket and Porvoon Tarmo in the Korisliiga, averaging 14.9 points in 31 games.

[7] He spent the 2005–2006 season with Union Neuchâtel in the SB League, averaging 13.6 points in 22 games.

Vassell served as the head coach of Niagara College Knights men's basketball team from 2014 to 2017, amassing a 34–19 record and back-to-back fourth-place finishes at the OCAA Championship.

[18] In August 2017, Vassell was hired as the head coach of London Lightning of the National Basketball League of Canada.

[20] In September 2019, Vassell was hired as an assistant coach to Durham Lords men's basketball team.