The Bulls agreed on a contract with free-agent guard Nate Robinson, the team announced Tuesday afternoon.
The seven-year veteran spent last season with the Warriors, where he averaged 11.2 points and 4.5 assists in just over 23 minutes per game.
In the Warriors' final two games of 2012, Robinson registered 28 points and eight assists against the Clippers, and 30 points and seven assists against the Spurs.
He played in 51 of the team's 66 games, making nine starts.
The Warriors weren't planning on bringing Robinson back next season, which became all but certain with the acquisition of Jarrett Jack.
Stephen Curry, Jack, and Charles Jenkins (whose contract for next season becomes fully guaranteed on Wednesday) comprise the Warriors' options at point guard in 2012-2013.