Still needing to fill out a few remaining roster spots, the Celtics agreed to a one-year contract with forward Shelden Williams, an NBA source told the Boston Globe.
Williams, 25, played 45 games with the Timberwolves and Kings last season. He averaged 4.1 points, 3.4 rebounds and 11.4 minutes per game off the bench for both teams.
The fifth overall pick in the 2006 NBA draft by the Atlanta Hawks, Williams averaged 5.5 points per game in 81 games for the Hawks, including 31 starts, in his rookie season in 2006-07. Since then, Williams has yet to play more than 64 games in a season and has not started a game since his first year in the league.
Williams was traded by the Hawks to the Kings in a package for point guard Mike Bibby on Feb. 16, 2008. After spending parts of two seasons with the Kings, he was traded to the Timberwolves in February for Rashad McCants and Calvin Booth.