O'Bryant was waived by the Bucks on Monday.
O'Bryant signed a training camp deal with the Bucks on Tuesday, Shams Charania of The Athletic reports.
O'Bryant tallied 16 points (7-9 FG, 2-4 3Pt) two rebounds and one assist across 19 minutes in Tuesday's 131-111 win over the Kings.
O'Bryant collected nine points (4-9 FG, 1-3 3Pt), three rebounds, three assists, and one steal in 16 minutes during Monday's 109-91 win over the Knicks.
O'Bryant is not listed on the injury report for Monday's game against the Knicks.
O'Bryant will not play in the second half of Saturday's game against the Trail Blazers due to personal reasons.
O'Bryant collected 14 points (4-7 FG, 6-6 FT), four rebounds and one block across 14 minutes during Monday's 103-94 loss to the Bucks.
O'Bryant is expected to serve as the backup center Friday against Atlanta.
O'Bryant tallied 11 points (4-9 FG, 1-2 3Pt, 2-2 FT), six rebounds and one assist through 23 minutes during Wednesday's preseason game against Boston.
O'Bryant (ankle) is not listed on the team's injury report ahead of Tuesday's game against the Hawks, Stephanie Ready of Fox Sports Southeast reports.