After going undrafted in the 2005 NBA draft, Lucas joined the Minnesota Timberwolves for the 2005 NBA Summer League. The Timberwolves also signed him to their training camp roster. During the 2005–06 NBA season, Lucas was called up by the Houston Rockets from the Tulsa 66ers in December 2005. He played 13 games for the Rockets between December and February. Lucas's call-up made him the first Tulsa 66ers player to be called up from the NBA Development League. He averaged 16.6 points in 33.2 mins per game with the 66ers.