The Thunder has signed guard Sedrick Barefield and forwards Vincent Edwards and Kadeem Jack, the team announced Saturday.
Barefield went undrafted this summer, after averaging 16.8 points and 3.8 assists per game in his senior year at Utah.
Edwards was on a two-way contract with Houston last season. He made two appearances with the Rockets, averaging 1.5 points in eight minutes.
Jack has spent the last four years bouncing around the G League. Last season, he averaged 6.1 points and 4.4 rebounds in nine games with the South Bay Lakers.
OKC waived four training camp invitees Thursday, making room for the three new additions during preseason.