The Warriors also announced Thursday that they waived forward Jeff Adrien. Both moves came before the start of the NBA lockout on Friday.
Amundson appeared in 46 games for the Warriors last season, averaging 4.3 points and 4.0 rebounds. Overall during his five-year NBA career, he has averaged 4.1 points and 3.7 rebounds in 228 regular-season games with Utah, Philadelphia, Phoenix and Golden State.
Adrien appeared in 23 games over two stints with the Warriors last season, averaging 2.5 points and 2.5 rebounds per game.