Jack had signed with New Orleans a week before training camp and averaged 3.3 points and two assists in three preseason games.
Jack has played 13 years in the NBA, including two stints with New Orleans. Jack has averaged nearly 11 points per game throughout a career that has included stints in Portland, Indiana, Toronto, Golden State, Cleveland, Brooklyn and New York. He averaged a career-best 15.6 points in the 2011-12 season with New Orleans.
Green signed with New Orleans in July after playing on the Pelicans' summer league team in Las Vegas. He averaged four points and 1.5 rebounds in four preseason games.
The Pelicans open the regular season Wednesday night in Houston.