Tatum turned the ankle in the final seconds of overtime in Team USA's 93-92 win over Turkey on Tuesday night. He was examined Wednesday and was declared out at least five days. He will get reevaluated on Monday.
Team USA plays Japan in its final pool play game Thursday. There is nothing at stake for either team; the U.S. has already advanced to the next round, and Japan has already been eliminated.
The U.S. will open second-round play Saturday in Shenzhen, but that is not an elimination game. The first time the Americans could face elimination is Monday, the day Tatum will be reevaluated.
Tatum is averaging 10.5 points in two games. He had 11 points and 11 rebounds against Turkey, including two clutch free throws that forced overtime.