Warriors guard Monta Ellis will likely miss the team's entire five-game road trip, which begins in Miami Tuesday night, the team announced.
Ellis missed Saturday's game against Detroit with lower back pain. An MRI on Ellis' back performed on Monday revealed a lower back strain.
Golden State faces the prospect of playing the road trip without both Ellis and starting center Andris Biedrins, who is sidelined with a strained right groin.
Meanwhile, the Warriors signed 6-foot-6 swingman Reggie Williams from the NBA Development to a 10-day contract. Williams averaged 26.4 points per game while shooting 58 percent from the floor for the Sioux Falls Skyforce.
Williams, 23, played collegiately at Virginia Military Institute, where he was the Big South Conference's all-time leading scorer.