Towns must pass tests and be symptom-free before he can play again, though he did travel with the team.
Follow Sporting News for our live blog as Dmitry Bivol defends his light heavyweight title against former champion Jean Pascal at the Etess Arena in Atlantic City, New Jersey.
Butler returned to practice earlier this month and is expected to play in the season opener Wednesday against the Spurs.
Follow along for scores and highlights as Croatia and England play for a spot in the World Cup finals. Read more about this at sportingnews.com.