Will Thomas graduated from George Mason University. The player began his professional career in Liege Basket and played in the Belgian League. In 2010 he was named the regular season MVP. Later he played in Oostende, Army Sport Club Tbilisi, Pinar Karsiyaka and Scandone Avellino.
In 2014, he signed with Unicaja Malaga. Two years later he moved to Valencia and won the ACB League, Spanish Supercup and Eurocup.
Last season in Eurocup Thomas scored 11.8 points, made 3.7 rebounds and 1.7 assists per game. He was named Eurocup Finals MVP.