Kurt Helin of ProBasketballTalk.com reported the specifics of the injury on Tuesday. Head coach Mark Jackson noted that Barnes will come off the bench when he does return, per the Bay Area News Group's Marcus Thompson:
Again, Mark Jackson says Harrison Barnes is out first two games. When he returns, he will come off the bench.— Marcus Thompson (@gswscribe) October 29, 2013
Barnes made his season debut Wednesday against the Timberwolves.