The sharpshooting forward had played for the Detroit Pistons and Golden State Warriors in this year’s NBA Summer League, but failed to secure a contract after scoring 17 points in two games.
His contract is a training camp invite with a non-guaranteed contract.
Watford last played for Israeli club Hapoel Fattal Eilat after going undrafted in the 2013 NBA Draft. He appeared in 29 games in the Israeli Basketball Super League, averaging 10.4 points and 5.6 rebounds per game.
The Birmingham, Ala., native played in Bloomington from 2009-13, establishing himself as a preferred frontcourt starter under IU Coach Tom Crean early in his freshman season. He graduated as the No. 9 scorer in IU men’s basketball history, tallying 1,730 points in his four seasons.
His signing, along with the addition of Tim Frazier earlier in the day, increases the Celtics roster to 20 players, the maximum amount allowed in the offseason.
Watford becomes the sixth Hoosier on an NBA roster, joining guards Victor Oladipo and Eric Gordon and forwards Cody Zeller, Noah Vonleh and D.J. White.
Alden Woods, ?Sam Beishuizen
