Holman, 24, is 6-foot-10 and went undrafted out of Mississippi State. He has spent time in the G League as well as Germany, as well as with the Celtics in the most recent summer league.
Renfro, 24, is 6-7 and played collegiately at San Francisco. He spent last season with the Austin Spurs and then played for San Antonio in summer league.
Both Holman and Renfro are likely headed to Austin after camp, with small guarantees should they make certain criteria centered on the amount of games played with the G League franchise.
The Spurs’ camp roster stands at 20 after the signings.