Dennis played with the Cuban men's national volleyball team at the 2000 Summer Olympics in Sydney, where he finished in seventh place.

[2] He helped the Cuban team win the bronze medal at the 1998 FIVB World Championship in Japan.

[3] After a period of inactivity, Dennis returned to play in 2003-2004 for Latina Volley, before moving to Lube Banca Marche Macerata the following year, after a short stint in Qatar.

[3] With Lube he won a top national division and an Italian Supercup in 2006, and two CEV Cups (2005–2006).

[3] In 2001, Dennis was one of six players on the Cuban men's national volleyball team to leave a hotel they stayed at in Flanders for a tournament, and from there rode a train to Italy for political asylum.